John Guest Speedfit Acetal Male Stem Adapters can be inserted into any John Guest Speedfit fitting to convert a quickfit fitting into a MPT swivel fitting. These male stem adapter fittings meet FDA standards and are NSF listed.
Make sure the stem is free from nicks and scratches
Push the stem into the fitting till it hits the stop
Pull the fitting back to make sure it is secure.
Test the system
Release system pressure
Push collet back squarely against the fitting body