3" inch, 3RV-TS, Round, Type B, Gas Vent Tee. Used in conjunction with a vertical vent system, to provide easy access for inspection and cleaning. Provides a transition from horizontal to vertical orientation. 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. Has an improved joint design provides for secure connection in seconds. From the Manufacturer 3" inch, 3RV-TS, Round, Type B, Gas Vent Tee. Used in conjunction with a vertical vent system, to provide easy access for inspection and cleaning. Provides a transition from horizontal to vertical orientation. 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. Has an improved joint design provides for secure connection in seconds.