ASCO® Solenoid Valve, 2" NPT, 2-Way, Normally Open, Brass Body, Slow Closing, 8221G033 AC 120/60 DThese pilot operated solenoid valves use an integral snubber to slow disc closing speed and protect your system against water hammer eliminating the need for surge suppressors or other controls in most water systems. Repair kits include: all internal parts that require replacement in normal service including discs seats springs cores and gaskets. Minimum pressure differential refers to the difference in pressure that must be maintained at the inlet