The Waterco Hydrostorm Plus Strainer Lid is a replacement part for Waterco Hydrostorm Plus pumps. This is a clear pump lid that is used for easy strainer basket inspection. It has a 150mm diameter where it goes into the housing. No thread on the lid and is held down by locking ring. If we find large air bubbles or no water at all in the strainer lid while the pump is running, that could be a sign of an air leak along the suction side.