RV Gravity Water Inlet Hatch White Caravan Accessories PartsRV Gravity Water Inlet Hatch White Caravan Accessories Parts The Gravity water inlet hatch is a small opening on the side of a caravan or RV that allows for the connection of an external water supply. The water inlet hatch is an essential feature for those who plan on staying in a caravan park or camping ground with facilities as it enables the use of those amenities. It is also useful for those who travel frequently and need to connect to various