Quick Connect Couplings are a fast and easy means of joining various pneumatic and fluid transfer lines. An automatic shut-off valve in the coupler end allows the quick connects to be disengaged without needing a separate ball or line valve. The size of the inlet thread is a good indication on the proper coupler size to use in order to maximize feasibility and flow. A short (3-10 ft) lead-in or whip hose coupled with solid male NPT ends will prolong coupler life as it will absorb vibration and reduce metal fatigue. You can differentiate between various Interchange Series by observing the differences in the nipple/plug nose (see the below "Actual Size Profile Chart") as well as with differences in the coupler sleeve. These quick connects will interchange with many popular brand names, such as: Amflo, Aro, Camel, Cejn, Coilhose, Dill, Dixon, Foster, Hansen, Lincoln, Milton, Nycoil, Parker, Perfecting, Schrader, Tomco, and Truflate (crossover tables are available).