Water Hammer Arrestor; Type Piston; Applicable Standard ANSI/ASSE 1010, UPC, NSF 61; Inlet Size 1/2"; Inlet Connection Socket; Top Shape Round; Fixture Unit Rating 1-4; Overall Height 4-1/4"; Gauge Assembly Supplied No; Body Material Copper Tube; Spherical Piston Material Polypropylene; Inclusions/Features (2) EPDM O-Ring; Maximum Working Pressure 350 PSIG; Temperature Rating 250 Deg F; Packaging Quantity 50 per Minimum, 50 per Case; Warranty Lifetime Limited