the valve closes the A-port and opens the B-port upon loss of power

Mounting hardware should be inspected and reused if in good condition

please note that covers are typically sold separately unless purchased as part of a specific kit

ensuring a consistent fail-safe flow path

The Packard PR290 fan relay is a direct functional equivalent to the White-Rodgers 90-290

Watts 0121528 Valve THPU32HP7Y the valve closes the A-portFor high capacity thermal protection on commercial boilers, the Watts 0121528 (equivalent to the Watts LF174A 150 1 1 4) provides reliable overpressure safety for hot water heating systems. This lead free pressure relief valve is built with a heavy duty copper silicon alloy body, specifically engineered to withstand corrosive water conditions without sticking or freezing. Featuring a factory set point of 150 psi and a high volume discharge capacity of