Being the world's leader in Push-to-Connect fitting technology parker's prestolok plop nickel plated Brass fittings provide a simple way of connecting tubes to a fitting in order to create a fluid distribution network. Prestolok plop metal fittings reduce assembly time by eliminating the use of a sleeve and tightening of a nut required in compression Style fittings. Simply push the tubing into the fitting until it bottoms. To disassemble, press the release button, hold against the Body and pull tubing from the fitting. A thread sealant is applied to all male threads eliminating the possibility of system contamination from PTFE tape.