RETROFIT CABLE GLAND WIRE SIZE 13.5MM CONNECTOR SIZE 20MM The Seaview Retrofit Cable Seal is the only guaranteed and proven watertight installation for your currently installed cables! In a new category of its own, the new Retrofit Cable Seal provides a watertight installation for your currently installed cables. No need to re-run your cables, simply install with your cable in place! The Seaview Retrofit Cable Seals provide a waterproof pass-through for antenna, transducer, lights, power and other cables without removal of the factory installed cable connector. These Cable Seals will work with more than one cable as long as each cable has its own hole and there is at least .125″ of rubber around each hole.