Effectively route wires through the firewall, core support or any other panel. Use a Wire Pass-Thru Connector and Grommet for wires you may need to disconnect for repairs or troubleshooting. #36-3584-F is a 4-wire connector and fits 1-1/4" holes. #36-3586-F is an 8-wire connector and fits 1-1/2" holes. Works with 12 to 18 gauge wires.