Protects RV Plumbing Against High Pressure; Without Check Valve; Factory Pre-Set To 45 PSI; Adjustable For Maximum Water Flow; With 3/4 Inch GSH Female Swivel Inlet And 1/2 Inch NPSM Male Outlet; Complies With CA and VT Regulations For Brass Content or Does Not Comply With CA and VT Regulations For Brass Content; With Gauge; Brass; With Retail Package