3 type B gas vent wall support or band assembly from the RV collection. The wall support or band assembly is used along the outside wall to provide for 1 clearance and assure stability. Also useful for suspending offsets. Must be installed just above the tee and every 6 thereafter. 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 connection in seconds. The use of our lock tab feature gives installers the option of engaging this tab instead of using sheet metal screws, when required by local code.