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Detail Drawing Grease Trap Three Compartment Sink with Grease Trap Grease traps shall have flow control restrictor and be vented A separate grease trap is required for each commercial dishwasher. Any floor grease traps must be an approved “floor” trap that is able to be installed below the floor level. Many standard “under-the-sink” units are not made of proper materials that allow an in-floor installation. Unapproved floor trap units will rust and leak within a few months of operation.