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The SEAL-TITE 217-20 is a 20-inch T-joint crimp-on run fitting manufactured in 24-gauge sheet metal. Designed for duct fabrication and branch takeoff connections, this fitting allows installers to tap a branch run off an existing main duct trunk without cutting into flexible or spiral duct sections. The crimp-on design secures to standard round duct sections for a tight mechanical connection. HVAC sheet metal technicians and duct installers use this type of fitting in both new construction and retrofit trunk-and-branch duct systems.
This fitting is suited for residential and light commercial forced-air duct systems where a T-branch connection is needed along a straight duct run. The 20-inch size positions it for larger trunk lines typical of main supply or return air applications. The crimp-on end allows direct connection to matching-diameter round duct without additional reducers or adapters in standard configurations.
Designed as an OEM-style duct fabrication component for trunk-and-branch forced-air HVAC duct systems using standard round duct connections.
Installation should be performed by a licensed HVAC technician or qualified sheet metal fabricator. Power down the air handler or furnace and close the system dampers before modifying any duct section. Secure all joints with sheet metal screws and approved duct sealant or mastic per local mechanical code requirements. Do not overtighten crimp connections, as deformation of 24-gauge material can compromise the seal.
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