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The IMPERIAL MFG GROUP USA INC GV0733 is a 4-inch, 30-gauge galvanized steel tee cap and plug designed to seal the branch opening of a round tee fitting in low-pressure vent and duct systems. The crimped edge allows it to seat securely against standard snap-lock or crimped round duct and B-vent fittings without additional fasteners. At 30 gauge, the sheet metal offers a balance of rigidity and workability suitable for light commercial and residential installations. HVAC sheet metal mechanics and installers typically use this plug to cap unused tee branches during system modifications or when rough-in work requires temporary or permanent sealing of an open port.
This tee cap and plug is suited for residential and light commercial HVAC duct fabrication and ventilation work. It fits branch openings on 4-inch round tee fittings commonly found in supply-air trunk-and-branch duct systems, exhaust vent runs, and B-vent configurations. It ships in a package quantity of 12 units, making it practical for contractors stocking job-site supplies or shop inventory for repeated use across multiple installations.
Designed as an OEM-style replacement and standard-fitment cap for 4-inch round galvanized tee fittings in residential and light commercial duct and vent systems.
Installation is typically performed by a licensed HVAC technician or sheet metal mechanic. Before capping any tee branch, shut down the air handling unit or exhaust fan serving the duct run and verify the system is depressurized. Press the crimped end of the plug firmly onto the open tee branch until it seats flush. Follow applicable SMACNA standards and local mechanical codes for duct sealing requirements.
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