This hatch cover has a threaded lid that includes an integral seal for a water-tight fit, and can be easily replaced when needed. As a recommendation, applying sealant around the lip and in the fixing holes will guarantee complete water-tightness when fitted. The A1737 hatch cover is a suitable alternative for RWO Marine’s 100mm hatch cover models (R4040, R4042, R4043, and R4044). For extra storage, pair this hatch with our hatch cover bag (A-BAG-KIT).