*May be larger and/or round.
**Consult factory for ISO 7 "Rp" threads.
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View Dimensions in PDF format

Nominal Pipe Size	Size Code	A	Hex Size B*	C**	Orifice Diameter
3/8	C	2.16	1	3/8 NPT	0.348
1/2	D	2.70	1-1/4	1/2 NPT	0.464
3/4	F	2.94	1-5/8	3/4 NPT	0.593
1	H	3.63	2-1/4	1 NPT	0.890
1-1/4	I	3.91	2-3/4	1-1/4 NPT	1.135
1-1/2	J	4.36	3-1/4	1-1/2 NPT	1.385