Drain flow control device for commercial drainage system

A flow control device for a sink that drains into a system that includes a grease interceptor, the flow control device comprising:

• a waste valve, said valve including a body defining a drain flow path having an outlet end;
• a hollow housing defining an interior and an exterior and an axial opening extending the length of said interior of said housing, said housing having a first end and a second end disposed opposite said first end, said first end of said housing being connected to said outlet end of said body of said waste valve, said housing defining a threaded surface beginning at said second end on at least one of said exterior and said interior of said housing;
• and
• a flow control insert, said insert being disposed across said interior of said housing to interrupt the flow of fluid leaving said waste valve, said insert defining a hole through said insert, said hole being sized such that the flow area through said hole is smaller than the flow area through said axial opening along said first end of said housing.