Scanstrut deck seal review - fitting to a kayak

As part of my kayak build project, the installation of my fish finder requires me to run cables from the cockpit of the kayak, through the plastic and into the hull cavity. This fitting needs to be watertight as I regularly launch the kayak into surf and I definitely don’t want any water leaking into the kayak (for obvious reasons).

I came across this deck seal by Scanstrut. The deck seal comes in 316 stainless steel with options for 16mm to 40mm connectors. I went with the 16mm “mini” version as I only needed to route two thin cables. – click here to see it on their website.

The deck seal looked well constructed, with the two halves (screwed together) fitting tightly. In the box, Scanstrut provide 4 x rubber grommets (or “cable glands”) to accommodate for a variety of cable diameters, they also included a non-drilled grommet which you can drill yourself if the others aren’t the right size.

attach the lower part of the deck seal over the hole using self tapping screws

Fitting the deck seal was far easier than I had expected. After I had decided on the position, I drilled a 14mm hole through the plastic and stuck the adhesive waterproof ring around the hole. The base section of the deck seal (pictured above) was fixed using 3 x self tapping screws (included with the kit).  The screws held really well, no additional fixing was required – it felt solid.

feed the wires through the hole and secure the rubber grommit

The cables were passed through the hole (easy), and then I fitted one of the rubber grommets. The grommets are designed to have a split from the hole in the center to the outer edge, this is so that you can bend it outwards around the wires and then close it up again.

Getting the right hole size is crucial to it being watertight, I tested mine after the installation with a hose pipe (all good!).

The final step is the attach the outer section, to do this you need to push the rubber grommet (with the wires running through) into the recess on the inside of the outer section. Its a really tight fit (to keep things watertight), I found it easier to push it in with a bit of wood doweling, but don’t use anything sharp as it might damage the rubber.

Once the grommet is located correctly, just screw on the outer section – hey presto! The deck seal looks really neat, and I m 100% confident in the fitting.

screw the upper part of the deck seal in place - job done!


  • Watertight installation
    Tapered bung forms watertight seal. All units are supplied with a closed-cell base seal – 100% waterproof. All models have been IPX6 and IPX7 tested and approved.
  • Easy and Reliable Installation
    Captive nuts make for easy assembly and also allow reliable repeat installations. Each unit supplied with both pre-drilled and blank inner seals to make your installation as easy as possible.
  • No need to remove cable connectors
    Split-seal option does not require connector removal during install
  • Multi-functional Dome shape
    Aesthetic dome-shaped profile provides a stronger, impact-resistant design (no sharp edges to hit your foot on!) and outer dome provides additional water shield.
  • Your Choice of Materials
    30% Glass-filled Nylon – UV-stable, hard-wearing or 316 stainless version available