The Xylem Bell & Gossett 189139 Bonnet & Retainer Assembly V01372-INDV is a replacement valve component designed for hydronic HVAC systems. This assembly secures and supports internal valve elements, ensuring proper alignment and controlled fluid flow within the valve body. Commonly used in boilers, chillers, and circulating pump systems, it helps maintain system pressure integrity an... https://www.partshnc.com/189139-xylem-bell-gossett-bonnet-retainer-v01372-indv