Xylem-Bell & Gossett 1BN321LF PT-42V 20-Gallon Lead-Free Potable Expansion Tank

The Xylem-Bell & Gossett 1BN321LF Lead-Free Potable Expansion Tank PT-42V is a pressure-control component used in hot water and hydronic heating in the HVAC system. That is interconnected with system piping and is designed with a 20-gallon capacity lead-free potable tank design to encourage pressurised water systems, which will assist in controlling the pressure variation. The excess water volume created during heating is absorbed, allowing the system to maintain balanced internal pressure. Within the vessel, there is a sealed diaphragm between the air and water to allow the water to fill the tank and squeeze the air cushion.