The Amtrol 30 Expansion Tank is designed to protect the HVAC systems by absorbing excess water pressure that accumulates in heating systems. With a 1/2” NPTM connection, it operates by allowing thermal expansion of water and avoiding damage to pipes, valves and other parts. This particular expansion tank is suitable for commercial and residential hydronic heating systems that include boilers where thermal expansion may lead to pressure spikes. Its robust design contributes to the extension of system life and efficient performance. This is necessary equipment for ensuring maximum performance and safety in HVAC systems.