TYPE B - GAS VENT Top 4" Round

A Type B gas vent cap (also called a rain cap, vent top, flue cap) is a fitting installed at the top termination of a Type B (B‑vent) gas vent system. Its purpose is to: Prevent rain, snow, debris, and animals from entering the vent pipe Provide a safe termination for combustion gases to exit the vent system Allow gases to be expelled safely while maintaining draft Protect the venting system from external elements and ensure compliance with codes This cap is specifically meant for Category I gas appliances that use a Type B venting system, which is a double-wall, air-cooled metal vent system for gas furnaces, water heaters, boilers, etc.