Oleopass The Oleopass is a concrete separator for underground installation with traffic load D400. Prefab basin of reinforced concrete C 35/45 is poured monolithically, in accordance with BS EN 206-1. The inner side is provided with an oil resistant coating on a cast surface. The cover plate and any build-up shaft are provided with an oil-resistant seal. The cast iron lid, traffic class D 400 (alt. B125), covers the oil separator. The internal built-in parts are made of high quality PE. The automatic closure of the outlet of the separator by means of a standard float is tared for liquids with a maximum density of 0.90 g / cm3. Abnormal densities are possible on request.