905358 (Febco) | 1/2 - 1 Inch | Plastic Air Gap DrainThis 1 2 to 1 Inch Plastic Air Gap Drain is Designed to be Installed Under The Masterseries (R) Reduced Pressure Assembly 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 905358