Valterra A01-2003BKVP Gravity Fresh Water Fill Inlet – BlackMost 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 (not included) and into the fresh water tank.Additional InfoFill Spout Dimensions (Nominal)1-1/8″ and 1-3/8″Barbed Connection1/2″MaterialPlasticColorBlack