Two piece screw-in 4 inch Access Port includes one deck ring and one lid. The deck ring is designed to install on a flat surface. The lip accommodates a Cat Bag (sold separately). This hatch is used on the flat locations on forward part of Nacra hull and has been used on Hobies and Prindles as well.
Flat Access Ports
The underside of port deck rings are flat and are to be used on the specialized flat locations on the decks of various catamarans, such as Hobie Cats, NACRAs, Prindles etc.
To prepare for replacement installation of your 4 inch Access Port, remove the old port and clean the contact surfaces. Fill fastener holes if they do not align with the new port.
To prepare for new installation of your 4 inch Access Port, cut new hole in the deck for the port. It helps to create a template, by placing the port ring on a piece of paper and tracing the outer ring. Cut out the ring on the outside of the trace line, to ensure that your hole is larger than the port ring. Trace the template onto the desired deck location. Drill a starter hole inside what will be the port, and use a jig saw or other fine control saw to cut through the deck along the trace line.
Apply marine sealant or your other preferred bedding compound to the underside of the ring and the inside edge of the port hole in the deck. With the lid assembled, install the ring into the deck.
Press assembly into position, aligning the deck curvature with the curve under the contoured ring. Press firmly, but keep top surface flat. Remove excess sealant.
Install fasteners ( we recommend nylon screws and nuts, because rivets or stainless hardware may exert excess force to distort the shape of the ring, or corrode and make future replacements difficult. (Aluminum rivets with backup washers are OK)
Do not over tighten the fasteners!