Camco 37002 Gravity Fresh Water Fill Inlet – Colonial WhiteMost trailers have a gravity fill inlet which allows you to fill the fresh water tank by loosely fitting the water hose to the fill inlet. Water should be turned on at a slow flow rate, allowing gravity to pull the water through the fill hose and into the fresh water tank. The inlet size is 1-3/8″ with a barbed fitting to connect your supply hose. Made of a durable plastic.Additional InfoOverall Dimensions (Nominal)3-1/4″W x 2-7/8″H x 4-1/4″DInlet Connection1 ” BarbedMaterialPlasticColorColonial White