The Baltimore Aircoil (BAC) 300472 Pump Seal Kit is a maintenance component designed to restore a secure, leak-resistant seal in compatible HVAC pump assemblies. It works by replacing worn or damaged sealing elements, preventing fluid leakage while maintaining proper pressure and efficient pump operation. Commonly used in cooling towers, evaporative condensers, fluid coolers, and othe... https://www.partshnc.com/20017210a-navien-tankless-water-heaters-o-ring