Profile: D & S Pump & Supply Co., Inc. specializes in residential and commercial water systems & water treatment equipment. Our products include pumps, tanks, UV systems, pipes, wires, & constant pressure VPD systems. We are associated with brands such as Amtrol, Wedeco, Zoeller, Adamson and Highland. The Amtrol® Therm-X-Trol® expansion tank has stainless steel system connection and molded, polypropylene liner for corrosion resistance. The Norwesco above ground tanks are polyethylene storage tanks, ranging in size from 12 gallons to 15,000 gallons. They have no seams, welds or joints to leak or rust.