Grease Interceptor boasts high-density polyethylene body and weir plates that remove grease from kitchen Advanced Drainage Systems, Inc., Hilliard, OHstreams and prevents it from entering sanitary sewer lines. Resistant to corrosion from food wastes, also acids and alkalis within operating pH. range of 1.5 to 14. Installs using minimum heavy equipment. Gravity flow units are available in 750-, 1,000-, and 1,500-gal. capacities with 8-in. standard inlet and outlet tees. Vertical weir plate divides unit into 2 chambers with 8-in orifice that allows lower level to flow to outlet. Oils and grease remain on surface where they can be removed by suction hoses.