Locks on for hands free filling of RV fresh water tank. Built-in flow control prevents tank pressurization. Reduces back pressure, cutting fill time in half. Large 3/8" opening valve and 5/8" tubing for the maximum fill rate. Easily slips into all fresh water tank fill fittings. Heavy-duty, lead-free construction with integrated shutoff valve. Clear fill tube is 7"L. | Valterra Secure Fill