Thomas Betts DX-1 Flange Gasket Duct Seal 1 Pound

Product Description

The THOMAS BETTS DX-1 is a gray duct seal compound used to block air, moisture, and pest infiltration at conduit and pipe entry points in electrical and mechanical installations. Sold as a 1-pound slug, it is a non-hardening, pliable material that fills gaps and voids around conduit knockouts, panel entries, and wall penetrations. Licensed electricians, HVAC technicians, and plumbers commonly use this product during rough-in and finish work wherever an airtight or weathertight seal is required at a penetration point.

This duct seal compound is suited for residential and light commercial applications. Typical uses include sealing conduit entries into electrical panels, meter bases, junction boxes, and building envelope penetrations where conduit or pipe passes through walls, floors, or ceilings. The gray color blends with common conduit and enclosure finishes. It is applied by hand or with a putty knife and requires no curing time before the penetration is considered sealed.

Key Features

• Non-hardening gray compound maintains a flexible, long-term seal at penetrations
• Blocks air infiltration, moisture intrusion, and pest entry at conduit and pipe entries
• Ready to apply without mixing, curing, or special tooling
• 1-pound slug format is easy to portion and store on a job site
• Suitable for use in electrical, HVAC, and plumbing penetration sealing applications

Compatibility

Designed as an OEM-style replacement duct seal compound for use at conduit and pipe penetrations in residential and commercial electrical and mechanical installations.

Installation Notes

Installation is typically performed by a licensed electrician or mechanical contractor. De-energize any panel or enclosure before working at conduit entry points, in accordance with NFPA 70 (NEC) lockout/tagout requirements. Pack the compound firmly into the gap around the conduit or pipe, ensuring no voids remain. Do not use as a structural filler or as a substitute for listed firestop materials where fire-rated assemblies are required.