to see the best way to seal it. I came up with several easy ways but this way would be the best. The ID/OD is very thick inwhich the back of it could be threaded and a cap screwed on then premark the 2 spots that need to be drilled for the wires (need to be soldered on) then seal the small holes for the wires after you screw on cap. Or just scrape out the outer edge (could scrape into wiring through...) get a block plug and drill holes for wires then press it in and seal the holes.