Southwark Metal 55NC_8IN Duct Tee End Cap 8 Inch

Product Description

The SOUTHWARK METAL 55NC_8IN is a no-crimp sheet metal duct tee end cap designed to terminate 8-inch round duct tee openings in forced-air HVAC distribution systems. Fabricated from hot-dip galvanized steel, this cap provides a durable, corrosion-resistant closure at unused or capped branch openings on trunk-and-branch ductwork layouts. The no-crimp design allows the cap to slip directly over the duct end without requiring a crimped male connection, simplifying installation in tight plenum and chase spaces. HVAC sheet metal technicians and duct installers use this fitting to seal off branch legs during system commissioning or future-use stub-outs.

This end cap is suited for residential and light commercial forced-air duct systems where 8-inch round tee branch terminations need to be sealed. It is appropriate for use in supply or return air trunk lines built to SMACNA and ACCA duct construction standards. Typical install scenarios include capping unused tee ports during phased construction, seasonal zone shutoffs, or trunk extensions where a branch opening must be temporarily or permanently closed.

Key Features

• No-crimp design slips over duct end without requiring a pre-crimped male connection
• Hot-dip galvanized steel construction resists corrosion in attic, crawlspace, and mechanical room environments
• 8-inch diameter fits standard round tee branch openings
• Meets SMACNA and ACCA applicable duct fabrication standards
• Plain end finish allows field sealing with mastic or foil tape per code requirements

Compatibility

Designed as an OEM-style sheet metal fitting for use with 8-inch round duct tee fittings in residential and light commercial forced-air HVAC duct systems built to SMACNA and ACCA standards.

Installation Notes

Installation is performed by licensed HVAC technicians or qualified sheet metal duct installers. Power down the air handling unit and close the disconnect before working inside a live duct system. Seal all joints with listed duct mastic or UL 181-rated foil tape in accordance with local mechanical codes and SMACNA guidelines. Do not leave unsealed gaps at the cap edge, as air leakage at termination points reduces system static efficiency.

Technical Specifications

• Diameter: 8 inches
• Material: Hot-Dip Galvanized Steel
• Type: No Crimp
• Applicable Standards: ACCA, SMACNA

Standard Information

• Brand: SOUTHWARK METAL
• Manufacturer Part Number: 55NC_8IN