For use in potable water installations involving IPS/CTS polyethylene piping/tubing, Matco-Norca offers stainless steel 304 insert stiffeners in five sizes up to 2”. Designed for insertion into the inside diameter of polyethylene piping/tubing, they feature an interlocking tab design to prevent the collapse of piping/tubing ends. The stainless steel ISP (for IPS polyethylene pipes) and ISCP (for CTS polyethylene tubes) insert stiffeners are available in both flanged and dimpled configurations in sizes ranging from 3/4” up to 2”.