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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Often powered sprayer and high pressure washing machine are threaded joints that are different from current standards, so these conversion adapters are very useful for removing parts such as nozzles and hoses.