The Hypro D30 Valve Repair Kit 1917 includes the 4 Valves and the 4 Valve O-rings required to repair your pump. If your Hypro Diaphragm pump is unable to draw fluid or the flow is inconsistent, it may mean your valve is not seating correctly. You should take the valves out and check for any debris that may have gotten in. Hypro Pumps are designed so that normal wear parts are easily accessible enabling regular pump maintenance to be quick and efficient.