Pneuflex's SPOC 16-03 model is 16mm O.D tubing x R 3/8 male thread hex socket head male connector stainless steel push in 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 3/8 female thread. 16mm x R 3/8 stainless steel round male straight pneumatic air fittings are composed of stainless steel body with stainless steel collet & FKM( Viton) seal, allowing steam, oil, water and other corrosive liquids flowing through.