{
 "version": "2026-10-20",
 "license": "Dimension sheets are written by Xem Studio from the cited sources and are free to use (CC BY 4.0, attribute 'Xem Studio'). Linked files belong to their publishers under the license shown; Xem Studio does not host them. 'license_verified: false' means the license shown is from memory or the publisher's page as last read and should be confirmed at the link before commercial use.",
 "slug": "tri-clamp-ported-end-caps",
 "name": "Tri-clamp end caps with ports: NPT, clamp nozzle, hose barb and airlock hole, 1½ to 8 in",
 "kind": "hardware",
 "category": "Hardware",
 "group": "Sanitary clamp fittings",
 "year": null,
 "question": "Is there a tri-clamp cap with a ½ inch NPT port?",
 "tags": [
  "cap",
  "ported cap",
  "npt port",
  "lid",
  "airlock",
  "blow off",
  "sanitary",
  "tri-clamp",
  "clamp fitting",
  "brewing",
  "homebrew"
 ],
 "aliases": [
  "tri clamp cap with npt",
  "tri clamp end cap 1/2 fnpt",
  "tri clamp lid with ports",
  "tri clamp airlock cap",
  "tri clamp blow off cap",
  "6 inch tri clamp lid with port"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": false,
 "free_files": 42,
 "url": "https://xemstudio.com/objects/tri-clamp-ported-end-caps/",
 "sheet_txt": "https://xemstudio.com/objects/tri-clamp-ported-end-caps/sheet.txt",
 "sheet": {
  "basis": "Xem Studio design on the standard solid cap (16AMP thickness per size): ports are ASME B16.11 Class 3000 half couplings tapped to B1.20.1 (drawn as the tap-drill bore), 1½ in clamp nozzles, a ½ in hose barb (14MPHR barb profile) or a plain Ø12.7 hole",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "Lids that take something: a thermometer or pressure gauge (¼ or ½ NPT), a ball-lock post or valve, a 1½ in clamp for a thermowell, airlock or spunding valve, a blow-off hose, or an airlock grommet.",
   "Ports are welded half couplings on the real part; here they are one solid with the cap.",
   "Every clamp face is the ISO 2852 profile used across this site: 2.85 mm rim, flat face with the gasket groove (K 1.6 deep, R3 1.2 bottom, 23° walls, P2 0.8 edges) on C2, 20° back cone. Flange C3 / groove C2 / tube OD × wall, mm: ½–¾ in 25.0 / 20.4 (derived) / 12.7–19.05 × 1.65; 1–1½ in 50.5 / 43.5 / 25.4–38.1 × 1.65; 2 in 64.0 / 56.5 / 50.8 × 1.65; 2½ in 77.5 / 70.5 / 63.5 × 1.65; 3 in 91.0 / 83.5 / 76.2 × 1.65; 4 in 119.0 / 110.0 / 101.6 × 2.11; 6 in 166.9 (6.570 in) / 156.5 / 152.4 × 2.77; 8 in 217.7 (8.570 in) / 207.0 / 203.2 × 2.77; 10 in 268.5 / 261.0 / 254.0 × 3.40; 12 in 319.3 / 311.8 / 304.8 × 3.40."
  ],
  "table": {
   "columns": [
    "size",
    "flange_od_mm",
    "cap_mm"
   ],
   "rows": [
    [
     "1–1½",
     50.5,
     6.35
    ],
    [
     "2",
     64,
     6.35
    ],
    [
     "2½",
     77.5,
     6.35
    ],
    [
     "3",
     91,
     6.35
    ],
    [
     "4",
     119,
     7.92
    ],
    [
     "6",
     166.9,
     11.1
    ],
    [
     "8",
     217.7,
     12.19
    ]
   ]
  }
 },
 "sheet_text": "Tri-clamp end caps with ports: NPT, clamp nozzle, hose barb and airlock hole, 1½ to 8 in — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/tri-clamp-ported-end-caps/  (CC BY 4.0)\nBasis: Xem Studio design on the standard solid cap (16AMP thickness per size): ports are ASME B16.11 Class 3000 half couplings tapped to B1.20.1 (drawn as the tap-drill bore), 1½ in clamp nozzles, a ½ in hose barb (14MPHR barb profile) or a plain Ø12.7 hole\nCatalog version: 2026-10-20\n\nSizes: see table below\n- Lids that take something: a thermometer or pressure gauge (¼ or ½ NPT), a ball-lock post or valve, a 1½ in clamp for a thermowell, airlock or spunding valve, a blow-off hose, or an airlock grommet.\n- Ports are welded half couplings on the real part; here they are one solid with the cap.\n- Every clamp face is the ISO 2852 profile used across this site: 2.85 mm rim, flat face with the gasket groove (K 1.6 deep, R3 1.2 bottom, 23° walls, P2 0.8 edges) on C2, 20° back cone. Flange C3 / groove C2 / tube OD × wall, mm: ½–¾ in 25.0 / 20.4 (derived) / 12.7–19.05 × 1.65; 1–1½ in 50.5 / 43.5 / 25.4–38.1 × 1.65; 2 in 64.0 / 56.5 / 50.8 × 1.65; 2½ in 77.5 / 70.5 / 63.5 × 1.65; 3 in 91.0 / 83.5 / 76.2 × 1.65; 4 in 119.0 / 110.0 / 101.6 × 2.11; 6 in 166.9 (6.570 in) / 156.5 / 152.4 × 2.77; 8 in 217.7 (8.570 in) / 207.0 / 203.2 × 2.77; 10 in 268.5 / 261.0 / 254.0 × 3.40; 12 in 319.3 / 311.8 / 304.8 × 3.40.\n\nsize  flange_od_mm  cap_mm\n1–1½  50.5  6.35\n2  64.0  6.35\n2½  77.5  6.35\n3  91.0  6.35\n4  119.0  7.92\n6  166.9  11.1\n8  217.7  12.19\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- ASME: B1.20.1 Pipe threads, general purpose (NPT): major diameter, L2, tap drill; B16.11 forged fittings (Class 3000 couplings); B36.10 Sch 40 bore — standard — ASME; dimensions are facts [verify license at link] — https://www.asme.org/codes-standards/find-codes-standards/b1-20-1-pipe-threads-general-purpose-inch\n- GW Kent: Tri-clamp fittings guide: tube OD, flange OD and ID per size to 12 in; solid cap thickness — web — publisher's guide; dimensions cited — https://www.gwkent.com/triclamp-guide\n- Dixon: 14MPHR brewery hose barb: A and barb OD B (hose ID + 0.040 in) per size, ½ to 6 in — PDF — publisher's catalogue; dimensions cited — https://www.cooneybrothers.com/userfiles/ad/documents/Dixon_Sanitary_14MPHRG600_Catalog.pdf\n- Rubber Fab: Tri-Clamp gasket dimensional chart: gasket ID, OD and bead diameter per size (2 in bead 2.22 in / 56.50 mm, 1.5 in 1.71 / 43.50, 3 in 3.29 / 83.50) — PDF — maker chart; dimensions are facts [verify license at link] — https://shop.andersonprocess.com/media/assets/product/documents/rubber-fab-tri-clamp-dimensions.pdf\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 42 parts): https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/index.json\nAPI: https://xemstudio.com/api/geometry?object=tri-clamp-ported-end-caps\n",
 "sources": [
  {
   "publisher": "ASME",
   "title": "B1.20.1 Pipe threads, general purpose (NPT): major diameter, L2, tap drill; B16.11 forged fittings (Class 3000 couplings); B36.10 Sch 40 bore",
   "url": "https://www.asme.org/codes-standards/find-codes-standards/b1-20-1-pipe-threads-general-purpose-inch",
   "formats": [
    "standard"
   ],
   "license": "ASME; dimensions are facts",
   "license_verified": false,
   "hosted": false
  },
  {
   "publisher": "GW Kent",
   "title": "Tri-clamp fittings guide: tube OD, flange OD and ID per size to 12 in; solid cap thickness",
   "url": "https://www.gwkent.com/triclamp-guide",
   "formats": [
    "web"
   ],
   "license": "publisher's guide; dimensions cited",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Dixon",
   "title": "14MPHR brewery hose barb: A and barb OD B (hose ID + 0.040 in) per size, ½ to 6 in",
   "url": "https://www.cooneybrothers.com/userfiles/ad/documents/Dixon_Sanitary_14MPHRG600_Catalog.pdf",
   "formats": [
    "PDF"
   ],
   "license": "publisher's catalogue; dimensions cited",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Rubber Fab",
   "title": "Tri-Clamp gasket dimensional chart: gasket ID, OD and bead diameter per size (2 in bead 2.22 in / 56.50 mm, 1.5 in 1.71 / 43.50, 3 in 3.29 / 83.50)",
   "url": "https://shop.andersonprocess.com/media/assets/product/documents/rubber-fab-tri-clamp-dimensions.pdf",
   "formats": [
    "PDF"
   ],
   "license": "maker chart; dimensions are facts",
   "license_verified": false,
   "hosted": false
  }
 ],
 "xem": {
  "status": "free-files",
  "sheet_free": true,
  "mesh_price_usd": null,
  "step_price_usd": null,
  "tolerance_mm": null
 },
 "related": [
  "tri-clamp-dome-lids",
  "tri-clamp-thermowells",
  "tri-clamp-hose-barb-adapters",
  "tri-clamp-female-npt-adapters",
  "tri-clamp-dished-bottom-vessels"
 ],
 "fits": [],
 "dimensions": "exact (nominal, no printing tolerance)",
 "dimension_rule": "All geometry on Xem Studio is exact (nominal, true size) with no printing tolerance. Where a part meets another part, the object lists its mating features (feature, exact size, what it mates with, fit class: press, slide, run, socket, clamp or designed). Apply your process's allowance to those features only; 'designed' gaps are part of the design and stay as drawn.",
 "mating": [],
 "faq": [
  {
   "q": "Which cap for an airlock?",
   "a": "The 1½ in or 2 in cap with the Ø12.7 hole takes a ½ in airlock grommet; or use a 1½ in clamp port and an airlock cap on it."
  },
  {
   "q": "Which cap for a thermometer?",
   "a": "A ½ NPT port takes a ½ NPT bimetal thermometer or a thermowell; or use a tri-clamp thermowell on a clamp port."
  }
 ],
 "files_license": null,
 "offers": [
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   "file": "cap-1.5in-1-8npt",
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   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-1.5in-1-8npt.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-1.5in-1-8npt.stl",
   "note": "1–1½ in cap with a ⅛ FNPT half coupling at the centre (tap-drill Ø8.6)"
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   "stl": "https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-1.5in-1-4npt.stl",
   "note": "1–1½ in cap with a ¼ FNPT half coupling at the centre (tap-drill Ø11.1)"
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   "stl": "https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-1.5in-grommet-hole-12.7.stl",
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  },
  {
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   "note": "2 in cap with a ½ FNPT half coupling at the centre (tap-drill Ø18.3)"
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   "note": "2 in cap with three ¼ FNPT half couplings on r 10.7"
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   "note": "2 in cap with a ½ in hose barb (blow-off)"
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   "note": "2½ in cap with a ⅛ FNPT half coupling at the centre (tap-drill Ø8.6)"
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   "note": "2½ in cap with a ½ FNPT half coupling at the centre (tap-drill Ø18.3)"
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   "stl": "https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-2.5in-3-4npt.stl",
   "note": "2½ in cap with a ¾ FNPT half coupling at the centre (tap-drill Ø23.4)"
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   "file": "cap-3in-1-8npt",
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   "stl": "https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-3in-1-8npt.stl",
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   "stl": "https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-3in-1-4npt.stl",
   "note": "3 in cap with a ¼ FNPT half coupling at the centre (tap-drill Ø11.1)"
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   "note": "3 in cap with a ½ FNPT half coupling at the centre (tap-drill Ø18.3)"
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   "note": "3 in cap with a ¾ FNPT half coupling at the centre (tap-drill Ø23.4)"
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   "file": "cap-3in-3x1-4npt",
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   "stl": "https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-3in-3x1-4npt.stl",
   "note": "3 in cap with three ¼ FNPT half couplings on r 16.4"
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   "file": "cap-4in-1-2npt",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-4in-1-2npt.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-4in-1-2npt.stl",
   "note": "4 in cap with a ½ FNPT half coupling at the centre (tap-drill Ø18.3)"
  },
  {
   "file": "cap-4in-3-4npt",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-4in-3-4npt.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-4in-3-4npt.stl",
   "note": "4 in cap with a ¾ FNPT half coupling at the centre (tap-drill Ø23.4)"
  },
  {
   "file": "cap-4in-3x1-4npt",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-4in-3x1-4npt.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-4in-3x1-4npt.stl",
   "note": "4 in cap with three ¼ FNPT half couplings on r 21.9"
  },
  {
   "file": "cap-4in-1.5in-port",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-4in-1.5in-port.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-4in-1.5in-port.stl",
   "note": "4 in cap with a 1½ in clamp nozzle at the centre, 1 in tall"
  },
  {
   "file": "cap-4in-1.5in-port-and-1-2npt",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-4in-1.5in-port-and-1-2npt.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-4in-1.5in-port-and-1-2npt.stl",
   "note": "4 in cap with a 1½ in clamp nozzle and a ½ FNPT half coupling"
  },
  {
   "file": "cap-6in-1-8npt",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-6in-1-8npt.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-6in-1-8npt.stl",
   "note": "6 in cap with a ⅛ FNPT half coupling at the centre (tap-drill Ø8.6)"
  },
  {
   "file": "cap-6in-1-4npt",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-6in-1-4npt.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-6in-1-4npt.stl",
   "note": "6 in cap with a ¼ FNPT half coupling at the centre (tap-drill Ø11.1)"
  },
  {
   "file": "cap-6in-1-2npt",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-6in-1-2npt.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-6in-1-2npt.stl",
   "note": "6 in cap with a ½ FNPT half coupling at the centre (tap-drill Ø18.3)"
  },
  {
   "file": "cap-6in-3-4npt",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-6in-3-4npt.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-6in-3-4npt.stl",
   "note": "6 in cap with a ¾ FNPT half coupling at the centre (tap-drill Ø23.4)"
  },
  {
   "file": "cap-6in-3x1-4npt",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-6in-3x1-4npt.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-6in-3x1-4npt.stl",
   "note": "6 in cap with three ¼ FNPT half couplings on r 33.0"
  },
  {
   "file": "cap-6in-1.5in-port",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-6in-1.5in-port.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-6in-1.5in-port.stl",
   "note": "6 in cap with a 1½ in clamp nozzle at the centre, 1 in tall"
  },
  {
   "file": "cap-6in-1.5in-port-and-1-2npt",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-6in-1.5in-port-and-1-2npt.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-6in-1.5in-port-and-1-2npt.stl",
   "note": "6 in cap with a 1½ in clamp nozzle and a ½ FNPT half coupling"
  },
  {
   "file": "cap-8in-1-8npt",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-8in-1-8npt.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-8in-1-8npt.stl",
   "note": "8 in cap with a ⅛ FNPT half coupling at the centre (tap-drill Ø8.6)"
  },
  {
   "file": "cap-8in-1-4npt",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-8in-1-4npt.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-8in-1-4npt.stl",
   "note": "8 in cap with a ¼ FNPT half coupling at the centre (tap-drill Ø11.1)"
  },
  {
   "file": "cap-8in-1-2npt",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-8in-1-2npt.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-8in-1-2npt.stl",
   "note": "8 in cap with a ½ FNPT half coupling at the centre (tap-drill Ø18.3)"
  },
  {
   "file": "cap-8in-3-4npt",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-8in-3-4npt.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-8in-3-4npt.stl",
   "note": "8 in cap with a ¾ FNPT half coupling at the centre (tap-drill Ø23.4)"
  },
  {
   "file": "cap-8in-3x1-4npt",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-8in-3x1-4npt.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-8in-3x1-4npt.stl",
   "note": "8 in cap with three ¼ FNPT half couplings on r 44.5"
  },
  {
   "file": "cap-8in-1.5in-port",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-8in-1.5in-port.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-8in-1.5in-port.stl",
   "note": "8 in cap with a 1½ in clamp nozzle at the centre, 1 in tall"
  },
  {
   "file": "cap-8in-1.5in-port-and-1-2npt",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-8in-1.5in-port-and-1-2npt.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-8in-1.5in-port-and-1-2npt.stl",
   "note": "8 in cap with a 1½ in clamp nozzle and a ½ FNPT half coupling"
  }
 ],
 "markdown": "https://xemstudio.com/objects/tri-clamp-ported-end-caps/index.md"
}