Injection Molded ABS
The Sea-Dog Screw Out Deck Plate with clear polycarbonate lid allows visual inspection of watertight compartments, storage lockers and fuel fittings without removing the lid. Use silicone sealant on hull or deck surface when installing the deck plate. Lubricate with Teflon grease or Vaseline and clean with hot, soapy water. Note: Avoid contact with acetone or strong solvents.
Above is Will Hladik's Musicbox2. He has cleverly used one of our 5" clear deckplates as a portlight.
Just came across a great idea for low-cost opening ports. To give credit where credit is due, the idea came from Wes and Anna Kisting. On the Pocket Cruiser that they built for a honeymoon cruise, they used clear watertight inspection hatches with some mosquito netting glued onto the rim to keep out the bugs. I see from your catalog that you carry the clear inspection hatches (and that Wes and Anna were not the only ones to think of using them for opening ports). Still, I think it's a good enough idea to give it a bit more exposure.