The Expello Air Products Automatic Drain Valve (12v-1/4 NPT) eliminates moisture in compressed air systems. (Part # 995111)The valve replaces the manual drain petcock on any air tank within a vehicle’s compressed air system, whether the tank is on a vehicle or trailer. Benefits:*Cleaner, Drier Air*Eliminate frozen air brakes* Increase Uptime* Air Brake System Component Protection* Easy Installation* Straight Through Design (Valve Does Not Collect Moisture and Debris)* Mounts Horizontally or Vertically