MIP threaded pipe in NPSM female threads

Question

I'm installing a freestanding tub faucet. According to the manufacturer's spec sheet the supply lines have 1/2 inch female NPSM threads, which I believe is a straight thread. I'm trying to attach these to 1/2 inch PEX-B. All of the male thread PEX fittings that I can find have MIP or MNPT threads, which I believe is a tapered thread.

Will the male MIP or MNPT be able to screw securely into a female NPSM? If not, then where would I find a fitting that would allow me to make this connection? Thank you.

@Ecnerwal Yes, there appears to be a gasket in them. I've added a photo. Thank you :) — balexand, Jun 11 '22 at 03:46
Those look like self sealing fittings without the proper mate they may not allow any flow. — Ed Beal, Jun 11 '22 at 22:56

score 1 · Accepted Answer · answered Jun 11 '22 at 11:33

1

Since you have the gasket required to make the seal, this marriage of star-crossed lovers should work out fine.

answered Jun 11 '22 at 11:33

Ecnerwal

174,759
9
212
440

Thanks, indeed it worked perfectly with the 1/2 inch MIP fitting. – balexand Jun 27 '22 at 17:45

MIP threaded pipe in NPSM female threads

1 Answers1