6815-3/4-HSS-1200 Piston-Type Pressure Relief/Regulating Valve.
Brass, 3/4" Inlet & Pipe Connection, 1200 psi max. Hardened Stainless Steel Seat.
Bypasses excess liquid. Adjustable to maintain control of line pressure at any pressure within the valve's operating range. Selected pressure setting firmly held in place by locknut. Extra large valve passages to handle large flows.
Also available in 1/2" and in 50 and 300 psi.
Looks well-made. We'll know soon if it works like I want it to.
Hope it does a great job!