Pneuflex's model of SPGJ 3/8-5/16 is 3/8" x 5/16" plug-in reducer - stainless steel pneumatic push-in fittings with stem which allows to be pushed into another pneumatic fittings. Its hose connection can connect tubing of reduced size. Composed of 316 stainless steel body and 301 SS collet & FKM (Viton) seal, stainless steel plug-in reducer push to connect fittings can withstand harsh, corrosive environment and can transfer air, water, oil, weak corrosive fluids, great for used in water treatment plants, food & beverage, medical and pharmaceutical industries.