The Armstrong Fluid Technology HD110108-200 S-45 LS/Volute with Viton Seal is a replacement circulator pump assembly designed for hydronic HVAC heating systems and domestic hot water recirculation applications. It operates using centrifugal force to circulate water through the system, supporting consistent fluid movement and efficient heat distribution. Featuring a durable Viton seal ... https://www.partshnc.com/hd110108-200-armstrong-fluid-technology-s-45-lsvolute-wviton-seal