Dorman 90303 Builders Series 7/8 Inch Diaphragm Grommet

The Dorman 90303 is a 7/8-inch rubber diaphragm grommet from the Builders Series, designed to route wiring cleanly and safely through sheet metal panels such as firewalls, floors, and bulkheads. Made from durable neoprene rubber, this push-in grommet provides a tight seal and reliable electrical insulation wherever wires or cables must pass through metal.

Key Features:

• Push-in installation — snaps into a 7/8-inch diameter hole with no special tools required
• Neoprene rubber construction — resists heat, moisture, and abrasion for long-lasting performance
• Diaphragm design — center membrane can be pierced or trimmed to accommodate various wire sizes and bundles
• Trimable opening — the center can be cut to a larger diameter for versatile use across repairs and custom builds
• Outside diameter: 7/8 inch | Inside diameter: 9/16 inch | Thickness: 5/16 inch
• Color: Black
• Limited Lifetime Warranty

Part of Dorman's Conduct-Tite Builders Series, the 90303 grommet is an ideal solution for custom automotive electrical installations, firewall wire routing, and general-purpose wiring pass-throughs in any sheet metal application.