Plumb Pak PP855-69 Air Gap for Standpipes, Grey

Standpipe air gap for washing machine discharge hoses, dehumidifiers, water filtration devices, water softeners or any appliance that drains into a standpipe. Allows soft rubber hose or aluminum drain hook to share a standpipe. Fits 1-1/2 and 2" metal or plastic standpipes. Water Softener air gaps are generally installed near the laundry facilities in the garage, basement or in the laundry room for convenient access to the house drainage piping and secondly, there almost never exists a dedicated (unused) standpipe just waiting to be used by the installer for surmounting their drain line air gap. Thus the critical feature of the air gap is its ability to share a standpipe with the washing machine drain hose Properly designed and installed, air gaps, like check valves, allow water to flow only in the desired direction. The key characteristics for an air gap is protection from back flow and back siphonage.