0881376 - Air Gap For 3/4 to 1 IN 009/909, 1 to 1 1/2 IN 009M2, and 1 1/4 to 2 IN 995 SeriesAir Gap For 3 4 to 1 IN 009 909, 1 to 1 1 2 IN 009M2, and 1 1 4 to 2 IN 995 Series This air gap for reduced pressure zone assembly, 3 4 to 1 IN series 009 and 909, 1 to 1 1 2 IN series 009M2, and 1 1 4 to 2 IN series 995, provides an unobstructed, physical separation between the discharge end of a potable water supply line and an open receiving vessel. The installation of an air gap and drain line are recommended on reduced pressure zone assemblies.