The Allen 108mm White Hatch Cover with Integral Seal includes a threaded lid and a tight seal that can be replaced if it becomes damaged. To guarantee complete waterproofing, it is recommended to use sealant around the lip and fixing holes during installation. The A1737 model is compatible with RWO Marine's 100mm hatch covers (R4040, R4042, R4043, and R4044). For extra storage, pair this hatch with our A-BAG-KIT hatch cover bag.