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air exhaust check valve for air/oil separator discharge

Thinking about replacing the check valve. Can anyone tell me the thread size and tube OD of the valve? Has anyone replaced their check valve? What was the reason for replacement? Leaking? Blockage?

The NAPA 2-29000 now seems to be numbered CRB 229000. Failure simply allows passage of air both ways. Just blow through it when it's off to clean the header tube. Be sure to install two, with one arranged as a safety blow-off. It stays closed as long as the primary valve is operating, and opens if the header tube gets clogged.

I machined off the nut portion of the valve in the photo. Simplify and add lightness...
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  • Safety Valve Drawing.jpg
    Safety Valve Drawing.jpg
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  • Safety Valve.jpg
    Safety Valve.jpg
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