905533 (Febco) | 1-1/4 - 2 Inch | 860 RP Aluminum Air Gap DrainThis 1 1 4 to 2 Inch Aluminum Air Gap Drain is Installed Under a Reduced Pressure Assembly, Series 860, to Catch Moderate Relief Valve Discharge Due to Pressure Fluctuations And Or Minor Check Valve Fouling. This Drain Reduces The Amount of Water Splashing in The Area Around Reduced Pressure Assemblies While Funneling Relief Valve Discharge Into The Drain. Febco 905533