Split Grommet Seal - 1in Hole

The Split Grommet Seal - 1in Hole is a precision firewall penetration solution designed for automotive electrical and fluid routing applications where factory firewall integrity must be maintained without permanent modification. Built by SEALS-IT, a trusted manufacturer in automotive sealing solutions, this split grommet accommodates a 1-inch diameter hole and provides a clean, professional seal around wiring harnesses, brake lines, fuel lines, and coolant hoses that pass through the engine firewall or custom vehicle builds and restorations.

This firewall grommet features a 3-inch outer diameter with a split design that allows installation without requiring complete removal of routed components, a critical advantage when retrofitting harnesses into tight firewall cavities. Constructed from durable aluminum and rubber, the Split Grommet Seal combines structural rigidity with vibration-damping properties essential for engine compartment durability. The 0.175-inch thickness and flat profile ensure flush mounting against firewall surfaces, while the natural rubber interior and black exterior finish resist heat cycling, oil exposure, and engine bay moisture—preventing the corrosion and separation common to inferior aftermarket alternatives.

Mechanics and fabricators performing engine swaps, custom wiring harness installations, and turbocharger manifold routing rely on this grommet to maintain OEM-quality firewall sealing without drilling additional holes. Its reliable design and materials make it an essential component for anyone looking to ensure a professional finish in their automotive projects.