Scanstrut

Using marine-rated cable is a must for your boat's stereo system, but you also need watertight installation for your antenna and navigation light cables. This horizontal cable seal from Scanstrut is easy to install, impact-resistant, and looks great. It's designed for connectors from 0.24" to 0.39" (6mm to 10mm). With a tapered bung and a closed-cell base seal, these sleek seals are rugged and water-resistant. Captive nuts make assembly easy and they can be used for repeat installations. The package includes pre-drilled and blank inner seals to make every installation easier. To get the look that's right for your boat, you can choose from black or gray plastic.