Selkirk-Metalbest Metalbest RV 3" x 5" Type B Gas Vent Double Wall Increaser

3" x 5" Type B Gas Vent Double Wall Increaser from the RV CollectionThis gas vent increaser allows you to adapt 3R" diameter pipe to DW" diameter pipe when required for your application.The RV series offers round gas vent pipe and fittings for residential, commercial and industrial applications. It features a snap together, non-positional lock system, die formed ends, and eliminates the need for all cutting, fitting and special engineering. It has an improved joint design provides for a rapid and secure ...