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The SOUTHWARK METAL 1070A3 is a 3-inch rain cap designed to protect flue and vent pipe terminations from precipitation, debris, and downdrafts. Installed at the top of a vent stack or chimney flue outlet, this cap prevents water intrusion that can corrode flue liners, damage heat exchangers, and degrade draft performance over time. It is a standard component in residential and light commercial venting assemblies and is typically installed by licensed HVAC technicians or sheet metal contractors as part of a new installation or service replacement.
This rain cap fits 3-inch vent pipe terminations and is suited for use on gas appliance venting, including natural gas and propane furnaces, water heaters, and boilers that use B-vent or single-wall metal flue pipe. It is appropriate for both new construction and retrofit applications where the existing cap is damaged, corroded, or missing.
Designed as an OEM-style replacement or new-installation rain cap for 3-inch flue and vent pipe terminations on residential gas appliances.
Installation is performed by a licensed HVAC technician or sheet metal contractor. Shut down and lock out the appliance before servicing any venting components. Ensure the cap is secured per local mechanical code requirements and the appliance manufacturer's venting instructions. Inspect the flue pipe connection for corrosion or improper slope before installing the cap.
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