This hatch cover has a threaded lid that is fully integrated with a water-tight seal, which can be replaced when necessary. To ensure maximum water-tightness when installed, we recommend applying sealant around the body's lip and in the fixing holes. The A1737 hatch cover is compatible with RWO Marine’s 100mm hatch cover models R4040, R4042, R4043, and R4044. For even more storage, pair this hatch with our A-BAG-KIT hatch cover bag.