There are three O-rings in a typical Diverter Valve: the valve cover O-ring and two Shaft O-rings. With time these O-rings become brittle and crack. Damaged O-rings on the suction side of the pump will let air into the system. Damaged O-rings on the discharge side of the pump will squirt water. These O-rings should be checked periodically and replaced if necessary. This guide shows you how to inspect and replace your Diverter Valve O-rings.