Rockford - Oil Interceptor - 9000 Gallon Capacity - SteelRockford roi 9000 oil interceptor 9000 gallon capacity steel a rockford separator is designed for exceptionally high efficiency in retaining a wide variety of insoluble wastes. Maximum water travel with minimized turbulence through the filtering action of its screens prevents evacuation into drainage systems which may cause blocking, stoppages and backups. The roi series is a new series of oil interceptors offer users a 17 models and holding