https://www.aulro.com/afvb/
Totally waterproof - and available from Jaycar - if you're willing to drill a hole in your roof that is :p
Printable View
https://www.aulro.com/afvb/
Totally waterproof - and available from Jaycar - if you're willing to drill a hole in your roof that is :p
IP68 Waterproof Cable Glands - from JaycarQuote:
These unique cable clamps incorporate a unique sealing mechanism which works on the camera shutter principle. Simply mount the clamp, insert the cable through and tighten up. There is no need to disassemble the clamp prior to installation. These clamps are rated to IP68. This is the highest rating possible. They are totally dust tight and protected against submersion in water.Other features include:- Trapezoidal thread for quick high torque tightening- No throwaway "O" rings - Long metric thread- Superior strain relief- PKT 2
You can also get them from any marine store - as it's what they use on the boats/ships etc.
Larry - I reckon you could as long as the plastic is strong enough that it won't crack once it's fitted ;)