PRV6 Brass Pressure Reducing ValveThe PRV6 Pressure Regulator from Aqualine is lead free brass construction. Has a durable brass bonnet with solder union x FPT connections. This item is rated for constant (static) pressure and will reduce the pressure in your system to the desired preset PSI. Unit is adjustable from 25 - 75 PSI and factory preset at 50 PSI.Installation Tips: Flush dirt and scale from supply pipe; Install regulator vertically or horizontally (upright or inverted), but the regulator must be installed with the arrow in the direction of flow; Regulator is preset at 50 PSI. To adjust, loosen locknut and turn adjusting screw clockwise to increase, counterclockwise to decrease, then re-tighten lock nut; This regulator has a built-in thermal expansion bypass. If the inlet pressure is higher than the discharge setting of the water heater (typically 150 PSI) or if there is a check valve or backflow preventer installed on the line, you must make provisions for pressure relief protection to protect your plumbing system and its components; Should be installed in an accessible location; Maintenance Tips: To clean strainer or replace seat/stem module shut-off supply, loosen lock nut and back off adjusting screw; Replace module and reassemble valve; Re-adjust pressure setting; IAPMO Listed; CSA Certified; NSF Listed; Certified to NSF/ANSI 372