Push-Quick Fittings allow full flow through the hose/tubing I.D. with no smaller orifice required as in barb fittings. Push-Quick Fittings are available in five sizes for 1/8, 5/32, 6 mm, 1/4 and 3/8 O.D. tubing. The 5/32 fittings may also be used with 4 mm O.D. tubing. They are designed for use with both flexible hose and stiff tubing made of nylon, polyurethane, polyethylene or polypropylene.