Arlington Industries SP363 Sill Plate, 1-1/4" EMT & 2/3" SEU, with Duct Seal & Wood Screws

Arlington Industries SP363 Sill Plate, 1-1/4" EMT & 2/3" SEU, with Duct Seal & Wood Screws

The Arlington Industries SP363 sill plate is designed to provide a clean, finished, and sealed wall or sill penetration for electrical service entrances that combine 1-1/4" EMT conduit with 2/3" SEU service entrance cable. Rather than sourcing conduit hardware, cable hardware, sealant, and mounting screws separately, the SP363 ships as a complete kit that includes duct seal and wood screws, so installers can mount the plate and pack the penetration in a single step. The sill plate is intended for exterior wall or sill entries where EMT conduit and SEU cable pass through the structure to reach a meter base, panel, or service equipment. By combining both the conduit and cable openings into one plate, the SP363 simplifies service entrance installations on residential and light commercial projects.

Key Features

• EMT Trade Size: Sized for 1-1/4" EMT conduit entry through the sill plate.
• SEU Cable Size: Accommodates 2/3" SEU service entrance cable through the same sill plate.
• Dual-Entry Sill Plate: Combines the EMT conduit and SEU cable openings into a single sill plate for one clean penetration point instead of two separate fittings.
• Includes Duct Seal: Duct seal compound ships with the plate so installers can pack around the conduit and cable for an air- and moisture-resistant seal at the entry point.
• Includes Wood Screws: Mounting wood screws are included, giving installers a complete, ready-to-install kit without sourcing separate hardware.
• Finished Appearance: The sill plate provides a uniform, finished cover at the wall or sill where conduit and cable enter the structure.

Technical Specifications

• Refer to manufacturer documentation for complete technical specifications.

Typical Applications

• Service Entrance Cable (SEU) Wall and Sill Entries
• EMT Conduit Wall and Sill Penetrations
• Residential Electrical Service Entrance Installations
• Light Commercial Electrical Service Installations
• New Construction and Retrofit Sill Sealing Projects

Why Arlington Industries?

Arlington Industries builds the SP363 sill plate as a complete, ready-to-install kit, pairing a dual-entry plate sized for 1-1/4" EMT conduit and 2/3" SEU cable with the duct seal and wood screws needed to finish the job. Supplying both the sealing compound and mounting hardware in one package helps installers standardize service entrance penetrations and avoid last-minute hardware runs. For electricians who need a dependable, purpose-built way to seal EMT and SEU entries at the sill, the SP363 delivers a complete solution from Arlington Industries.