ALL WETTED PARTS PTFE WITH FLOATING FLANGES. WSF series is constructed of flexible heavy wall extruded seamless vacuum-formed white tube of oper pitch convoluted PTFE with a stainless steel braid. The PTFE tube is flared over the face of the flange stub, creating and all wet seal. The media does not come in contact with any metalic material on the hose. WSF is ideal for situations where internal corrosion of the fitting and contamination of the chemical is not tolerated