ITEM NAME:One-Way Water Valve Gravity City Water Inlet Fill Hatch Lock for RV Camper Car.Can Fit Into Water Inlet Hatch. Water Inlet Is Used For RV Fresh Water System And It Is Constructed With UV Stabilized Plastic. There Are A Check Valve Inside And 19mm Water Inlet. 1 X Water Inlet. Stainless Steel Filter; Constructed With Plastic.