The Armstrong circulator pump is one of the best on the market and with their expertise in fluid flow, heat transfer, variable speed, and demand based control, Armstrong Fluid Technology leads the fluid systems industry, including plumbing and hvac in providing the most energy efficient and cost effective solutions to building professionals and owners around the globe. We carry both the commercial and residential line of Armstrong Pumps including commercial series 4030 base mounted end suction pumps, series 5200 & 5240 sump sewage pumps and series 4300 vertical in-line pumps, series 4360 vertical in-line pumps, 4380 vertical in-line pumps. Most residential pumps are normally stocked including the Armstrong Astro circulators, Armstrong series E.2 circulators and the Armstrong series S&H 3-piece circulating pumps.