Split Grommet Seal - 1/2in Hole

The Split Grommet Seal - 1/2in Hole from SEALS-IT is a precision firewall grommet engineered for custom automotive electrical routing and cable management. This split-design grommet serves mechanics and fabricators who need a reliable, reusable seal when running wiring, fuel lines, or hydraulic hoses through vehicle firewalls, bulkheads, or structural panels. Whether you're building a custom engine harness, installing aftermarket gauges, or retrofitting auxiliary systems, a properly sealed penetration prevents moisture ingress, vibration wear, and electrical shorts that can compromise years of modification work.

Constructed from a durable combination of aluminum and natural rubber, this grommet features a 3-inch outer diameter with a 0.5-inch inner hole sized for 1/2-inch diameter cables or conduit. The 0.175-inch wall thickness and flat design allow it to seat flush against flat or slightly curved surfaces without creating stress points. The split construction (as indicated by its name) means the grommet can be installed and removed without disassembling adjacent components—a critical advantage during prototyping, troubleshooting, or future upgrades. The rubber component provides vibration damping and environmental sealing, while the aluminum backing ensures structural integrity and corrosion resistance in engine bay conditions.

This grommet is ideal for custom wiring harness installation, fuel system retrofits, cooling system modifications, and any application requiring a sealed cable pass-through in aluminum, steel, or composite panels. Fabricators and restoration specialists favor split grommets because they accommodate future reconfiguration without requiring panel modification. Weighing just 0.05 lbs and compact at 3.05 × 0.3 × 4.05 inches, it installs easily in tight engine compartments or firewall spaces. Verify your hole diameter and panel thickness before ordering; this 1/2-inch hole size accommodates standard automotive wire looms, vacuum hoses, and single-conductor cables commonly used in performance and custom builds.