Speedaire 3Z323 check valve

by Dave
(S Florida)

Speedaire 3Z323 check valve

Speedaire 3Z323 check valve

My father gave me his Speedaire 3Z323 compressor. It's an oldie but a goodie. The check valve started leaking so I tried to buy a new one. I found parts lists on line but they were for 3Z323B and 3Z323E and the check valve does not look like mine. I decided to just buy an intank check valve with 1/2" Compression inlet and 1/2" NPT for the tank which was my best guess but the tank threads do not fit (1/2" Comp is correct) and neither does 3/8" NPT. Might you know what it could be? I have attached a picture.

Comments for Speedaire 3Z323 check valve

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Jul 27, 2018
3Z323 (B)
by: Doug in s.d.ca

The 3Z323B uses this:

1/2" compression x 7/8"-14 UNF-2A threads.

Check the specs on that thread, and see if maybe that's it.

If not, careful measuring should tell you it's either UNF or BSP.

Good luck, and let us know what you find, please.

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