Be sure to screw the screw type(JIS, PF, PT, metric screw threads, unified screw thread, NPT, etc.) and seat surface(male seat, female seat, packing seat, O-rings, etc.), because the adapter is just a coupling connecting the body and the cap of the hose.
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Although it was originally made of steel, although rust replaces severely, steel made cheap but soon it gets rusted, so we replaced it for this stainless steel. Result Large Correct! It will not rust! I think that it is cheap considering durability.