SELKIRK CORP 104460 4-Inch  Galvanized Pipe Collar,SELKIRK CORP,104460" /> Manufacturer: Selkirk Manufacturer part Number: 104460 Gas vent Type embody, 4 in pipe collar - 503841 4", 4RV-GC, Galvanized, Pipe Collar, Round, Type B Gas Vent Pipe collar provides a decorative and finished appearance for the pipe as it passes through the wall or ceiling of your living room Form meets function as it also serves as a firestop RV series offers round gas vent pipe and fittings for residential, commercial and industrial applications Features a snap together, non-positional lock system, die formed ends and eliminates the need for all cutting, fitting and special engineering