> There's a good chance that if this is an original trunnion,
> the fitting is a BSP (British Straight Pipe) thread.
Nope, the TR3 fittings are definitely tapered threads. 1/8 BSPT (British
Standard Pipe Tapered) is close enough that they might interchange to some
extent (.021" smaller and 28 tpi instead of 27); but the one I checked was
definitely NPT.
Randall
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