Pneuflex's model of SPGJ 08-04 is 8mm x 4mm plug-in reducer - stainless steel push-in fittings, having one hose connection of 4mm, and stem which can be pushed into another push-in fittings with larger diameter of 8mm. Constructed of high grade 316 stainless steel, these durable plug-in reducer pneumatic fittings offers high corrosion and chemical resistance, suitable for chemical-involved applications.