VALVE, ASCO SOLENOID EF8221G013 2 2 WAY N/C 120 VACDescription Slow Closing Anti Water Hammer 3 8" to 2 1 2" The ASCO 8221 Series is a 2 way solenoid pilot operated valve available in Normally Closed and Normally Open constructions and in AC and DC brass bodies. The 8221 Series is designed to effectively reduce damage caused by water hammer. Special Features: Pilot operated, normally open or normally closed Snubber slows disc closing speed to protect system against water hammer damage more effectively