I did mine by using on old shower curtain rod laying around cut it about 4" the first time,was too short, then cut it about 8-10" then hammered the round end square and used my new one as a reference to how much to square up the shower curtain end, then used a long needle -nosed pliers to take off the rubber off the old pcv valve,guided the rod to the old valve twisted and removed,put the new valve in the rod and inserted back again.Just gotta watch when removing rubber hose and not to tear it.