BackStop® A Series Tanks are fixed-diaphragm type, precharged thermal expansion tanks that are designed to absorb the expansion forces and control the pressure in potable water systems. Water is contained using the heavy-duty diaphragm with a FDA grade polypropylene liner preventing tank corrosion and waterlogging problems.    

The shell is designed from carbon steel and the system connection is 304 Stainless Steel. The A Series has a triple layer coating of electrostatic almond paint. The diaphragm is made from heavy duty Butyl rubber and the liner material an FDA grade Polypropylene.

All A-Series are factory pre-set pressure of 35 PSI, but have a maximum operating pressure of 150 PSI with a maximum design temperature of 200F

BackStop A Series Tanks are installed on the cold water line of the water heater to protect the system from the damaging effects of thermal expansion and increased pressure. The tank controls excessive pressure generated inside the water heater using a sealed compressible air cushion space to store and hold the additional expanded water volume.
Choose an installation location where leakage will not cause property damage and water draining is ideal.