We supply the highest quality gasket material for hatches and ports of any size from any brand. We will ship the gaskets and glue to you directly or we can replace them when we are repairing your marine windows at our Professional Hatch and Port Repair Facility. First, the old gaskets must be completely removed, then a very small bead of our special adhesive is applied to the center of the groove. The correct diameter gasket is then pressed into the groove. The ends are butted together and sealed with a small dab of the sealant. The new gasket will then set in 2-3 hours, depending on temperature. The first few times that the hatch or port is closed will be difficult as the gasket starts to take on the shape of the frame.