3" Groove Rubber Grommets – Reliable Sealing for 3" Panel Holes

Shop 3 inch rubber grommets — large-format grommets with a 3" groove diameter for big panel openings. At this size, grommets line pass-through holes for thick hose runs, duct stubs, multi-cable bundles, and plumbing penetrations in equipment cabinets, marine bulkheads, HVAC panels, and industrial enclosures — protecting everything passing through and giving the opening a finished edge.

Sizing check: the panel opening diameter equals the groove diameter. Large grommets still follow the same four dimensions — see how to measure a rubber grommet — and every size from 1/4" to 4-3/16" is one click away in the Rubber Grommet Size Chart & Finder. Buying for a production run? Bulk pricing available.