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2½ in cap with a ½ FNPT half coupling at the centre (tap-drill Ø18.3)

Exact dimensions. True size, no printing tolerance added. Threads are plain cylinders at the major diameter.

STEP STL free, CC BY 4.0 (credit "Xem Studio")

Dimensions

size	2½
flange_od_mm	77.5
cap_mm	6.35

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From the full sheet

Tri-clamp end caps with ports: NPT, clamp nozzle, hose barb and airlock hole, 1½ to 8 in: every size, notes, mating features and sources. Is there a tri-clamp cap with a ½ inch NPT port?

Other sizes

1–1½ in cap with a ⅛ FNPT half coupling at the centre (tap-drill Ø8.6)
1–1½ in cap with a ¼ FNPT half coupling at the centre (tap-drill Ø11.1)
1–1½ in cap with a Ø12.7 (½ in) hole for an airlock grommet
1–1½ in cap with a ½ in hose barb (blow-off)
2 in cap with a ⅛ FNPT half coupling at the centre (tap-drill Ø8.6)
2 in cap with a ¼ FNPT half coupling at the centre (tap-drill Ø11.1)
2 in cap with a ½ FNPT half coupling at the centre (tap-drill Ø18.3)
2 in cap with a ¾ FNPT half coupling at the centre (tap-drill Ø23.4)
2 in cap with three ¼ FNPT half couplings on r 10.7
2 in cap with a Ø12.7 (½ in) hole for an airlock grommet
2 in cap with a ½ in hose barb (blow-off)
2½ in cap with a ⅛ FNPT half coupling at the centre (tap-drill Ø8.6)
2½ in cap with a ¼ FNPT half coupling at the centre (tap-drill Ø11.1)
2½ in cap with a ¾ FNPT half coupling at the centre (tap-drill Ø23.4)
3 in cap with a ⅛ FNPT half coupling at the centre (tap-drill Ø8.6)
3 in cap with a ¼ FNPT half coupling at the centre (tap-drill Ø11.1)
3 in cap with a ½ FNPT half coupling at the centre (tap-drill Ø18.3)
3 in cap with a ¾ FNPT half coupling at the centre (tap-drill Ø23.4)
3 in cap with three ¼ FNPT half couplings on r 16.4
3 in cap with a 1½ in clamp nozzle at the centre, 1 in tall
4 in cap with a ⅛ FNPT half coupling at the centre (tap-drill Ø8.6)
4 in cap with a ¼ FNPT half coupling at the centre (tap-drill Ø11.1)
4 in cap with a ½ FNPT half coupling at the centre (tap-drill Ø18.3)
4 in cap with a ¾ FNPT half coupling at the centre (tap-drill Ø23.4)
4 in cap with three ¼ FNPT half couplings on r 21.9
4 in cap with a 1½ in clamp nozzle at the centre, 1 in tall
4 in cap with a 1½ in clamp nozzle and a ½ FNPT half coupling
6 in cap with a ⅛ FNPT half coupling at the centre (tap-drill Ø8.6)
6 in cap with a ¼ FNPT half coupling at the centre (tap-drill Ø11.1)
6 in cap with a ½ FNPT half coupling at the centre (tap-drill Ø18.3)
6 in cap with a ¾ FNPT half coupling at the centre (tap-drill Ø23.4)
6 in cap with three ¼ FNPT half couplings on r 33.0
6 in cap with a 1½ in clamp nozzle at the centre, 1 in tall
6 in cap with a 1½ in clamp nozzle and a ½ FNPT half coupling
8 in cap with a ⅛ FNPT half coupling at the centre (tap-drill Ø8.6)
8 in cap with a ¼ FNPT half coupling at the centre (tap-drill Ø11.1)
8 in cap with a ½ FNPT half coupling at the centre (tap-drill Ø18.3)
8 in cap with a ¾ FNPT half coupling at the centre (tap-drill Ø23.4)
8 in cap with three ¼ FNPT half couplings on r 44.5
8 in cap with a 1½ in clamp nozzle at the centre, 1 in tall
8 in cap with a 1½ in clamp nozzle and a ½ FNPT half coupling