Pipe Diameter: 0.8″. Flange Diameter: 2.4″. Factory-manufactured split design for rapid installation with plastic and metallic pipes in fire-rated divisions. Heavy gauge, chromium rich 316 stainless steel construction. Resistant to aging and weathering, no soluble or hygrosopic ingredients. Designed for high volume of char and rapid expansion. Split collar to fit around existing metallic and non-metal pipe. Won’t damage outside surface of pipe. Can be installed without hot work.