Therm-X-Span T-12 Thermal Expansion Tank 4.4 gal 15 GPD The default setting for this

The default setting for this pressure relief valve is 170 PSI

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Therm-X-Span T-12 Thermal Expansion Tank 4.4 gal 15 GPD The default setting for thisThe Therm X Span T 12 Thermal Expansion Tank is a pre pressurized diaphragm expansion tank. The tank is installed on the cold water supply line to the water heater to control pressure build up caused by thermal expansion. Installing the T 12 will virtually eliminate relief valves spills, protect plumbing fixtures and extend the life of your water heater. Specifications: Diaphragm Material: Butyl Rubber EPDM Factory Pre Charge: 40 psig Max Operating