Vrupin 188 Pieces Closed Rubber Grommet Firewall Solid Closed Hole Plug Assortment Kit for Wire Electrical Appliance Plumbing

Have used and there are no issues

These grommets are designed to be used for firewall access on a vehicle, but I've found dozens of uses in other situations where I either need a hole in something or I need to run a wire through some other material. These give a good piece of mind that I'm not going to be fraying the wire, and they do a good job of holding the wire secure. I like that they're not left open so you can make the hole for the wire whatever size or even shape you need.

Plug the hole perfectly. Cut a slice to run wire through adding a little bit of caulking and sealed perfectly

The sealing plugs/grommets are great for wiring a steel framed trailer. You can either plug a drilled frame hole or insulate an exit hole from chaffing the wires that come out of the frame to a light fixture. They are nice soft rubber and work great!!

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