Southwark Metal 55_10IN Duct Tee End Cap 10 Inch

Product Description

The SOUTHWARK METAL 55_10IN is a 10-inch diameter sheet metal duct tee end cap designed to terminate open tee branches in forced-air HVAC duct systems. Fabricated from hot dip galvanized steel, it provides durable corrosion resistance suitable for both supply and return duct applications. The crimped end allows for a secure, friction-fit connection to standard round duct fittings without additional fasteners during initial positioning. HVAC installers and sheet metal mechanics use this cap to seal unused tee outlets, maintain system static pressure, and keep debris out of inactive duct branches.

This end cap is suited for residential and light commercial forced-air duct systems where a 10-inch round duct tee branch requires capping. It is commonly installed during new construction, system modifications, or duct balancing work where a branch run is not yet activated or has been decommissioned. The crimped profile seats over the male end of a standard round tee collar, making it a straightforward field fit for trunk-and-branch duct layouts built to SMACNA or ACCA standards.

Key Features

• 10-inch diameter fits standard round duct tee branch outlets
• Hot dip galvanized steel construction resists corrosion in attic, crawlspace, and mechanical room environments
• Crimped end provides friction-fit engagement over male duct collars
• Manufactured to ACCA and SMACNA applicable standards for sheet metal ductwork
• Seals inactive tee branches to maintain system static pressure balance

Compatibility

Designed as an OEM-style sheet metal fitting for use with standard 10-inch round duct tee fittings in residential and light commercial forced-air HVAC systems built to SMACNA and ACCA duct construction standards.

Installation Notes

Installation is performed by licensed HVAC technicians or qualified sheet metal mechanics. Power down the air handling unit and confirm the system is de-pressurized before working on duct branches. The cap should be seated fully over the tee collar crimp; apply sheet metal screws and foil-backed mastic or UL 181-rated tape to permanently secure and air-seal the cap per SMACNA installation guidelines. Do not use this cap on pressurized duct branches intended for active airflow without verifying it is listed for that application.

Technical Specifications

• Size: 10 inches diameter
• Material: Hot Dip Galvanized Steel
• End Type: Crimp
• Applicable Standards: ACCA, SMACNA

Standard Information

• Brand: SOUTHWARK METAL
• Manufacturer Part Number: 55_10IN