Pneuflex's SPOC 16-04 model is 16mm O.D tubing x R 1/2 male thread hex socket head male connector stainless steel pneumatic air fittings, with which round body and internal hexagon allows them to be installed anywhere space is limited. Connect 16mm pneumatic tubing made of nylon, PU, PE, Teflon and installed to R, PT, BSPT 1/2 female thread. 16mm x R 1/2 stainless steel round male straight push to connect air fittings are composed of stainless steel body with stainless steel collet & FKM( Viton) seal, which is highly resistant to corrosion and widely used in food, beverage, chemical, medical and pharmaceutical industries.