The Thru-Wall Sump Strainer from Buyers Products is designed to stop items from getting back into fluid reservoir and causing damage. The cleanable and reusable strainer can stop items 150 microns or larger at the suction port of your reservoir, using a pleated element of stainless steel wire cloth (100 mesh). It's constructed tough, with cast iron bushings and leak-free bonding epoxy. The strainer installs into the wall of the reservoir and is available in a range of port sizes and flow rates.