Avoid these tees. The threads are different from the standard 1/4 NPT threads and standard air fittings will not work with them. I've tried several fittings from different companies and none of them screwed in more than 1-2 threads. Giving them back is harder than they're worth, so they throw them in the trash and I'll take a set of Harbor Freight t-shirts. Their Chinese made products appear to be of a higher quality than the Chinese parts found at Revain.
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