Bock 21785 1 in. temperature and pressure (T&P) relief valve, Watts 140X-6 type, for Bock commercial water heaters.

Fits:

• OptiTHERM OT125 through OT250
• Bock 72E and 73E oil-fired water heaters

• 1 in. female NPT inlet and outlet
• 6 in. extension thermostat
• Set at 150 psi / 210 F

Genuine Bock replacement part.