Pneuflex's model of SPG 12-10 is 12mm to 10mm stainless steel union straight reducer push to connect fittings, used to connect 12mm O.D tubing to 10mm O.D tubing in the same direction. 12mm to 10mm SS union straight reducer push-in fittings has a 316 stainless steel body, with 301 SS lock claw & FKM ( Viton ) seal, commonly used in food and other aggressive environment.