Pressure Relief Valve

Pressure Relief Valve Aeration » Regenerative Blowers » This valve, designed for low-pressure blowers, will automatically prevent your system from exceeding its maximum allowable pressure. Adjustable from 30" to 120" H2O (1-6 psi). Can be noisy when dumping air, so add muffler (BM40) and a steel coupler (not included) if you plan to use it as a normally open bleed valve. Weighs 8 lbs, 1-1/2" NPT.