HABA 1 x Rheinland Water Cap with Push Fit Connection for a Water Hose with built in water over pressure valve. Used as a replacement Onboard Water Tank Replacement Cap to enable easy refill of the water tanks. Fits most UK built motorhomes. Suitable for 55mm Water Inlets. Water cap diameter 7.9cm Cap diameter 8cm ( Not Suitable for Fiamma Inlets) (Full Box Quantity = 48) This product also fits parts ES2100 & ES2200. Not suitable for the smaller European models.