McMaster 4599K45 Gradual On Off Valve, Bronze Body & Gate, Easy Maintenance, Wheel Handle Rising Stem, 1 NPT Female, Class 150, MSS SP 80 30VM4071 ) 60 Leaves Narrow Design ) 60 Leaves Narrow Design With Flattened Teeth Locking Device Yes Thread Type Metric Included Threads per Inch 4 to 84 TPI Maximum Thread Pitch mm 84 Thread Angle 60 Degrees Gauge Material Steel Minimum Thread Pitch mm 4 TPI Range 4 to 84 TPI Package Quantity 1 Anti Kickback Clutch Type Electronic Application Cutting and Tuckpointing Maintain and repair these valves while they're still inline — you can disassemble the stem so there's no need to unthread the pipe connections they open and close gradually to prevent sudden starts and stops