1 1/4 inch dia outer thread, 12 TPI. Center thru hole = 3/8" pipe thread, Material = ASA plastic that is oil resistant.   Perfectly smooth running threads.  O-ring gasket included.   This is for one part only.   3/8 inch pipe nipple is not included.  

Standard Lycoming (not Thunderbolt) and Superior Oil Cap - Dehydrator Connection


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