The Clippard Push-Quick Fitting guarantees easy connection of pneumatic components to other piping systems and each other. Designed to be used with stiff tubing and flexible hosing made of urethane nylon, polypropylene and polyethylene, the push quick fitting provides greater flow rates in comparison to barbed fittings, and provides complete flow through hose / tubing I.D. with no need for smaller orifice requirements. Push Quick Fitting come in nine sizes, namely 1/8 , 5/32 , 6mm, 1/4 and 3/8 O.D. tubing. The 5/32 fitting can also work with the 4mm O.D. tubing.