What is a Triple Interceptor? February 24, 2016 Above ground Triple Interceptor (Grease Trap) Triple Interceptor: A Triple Interceptor is also known as a Food and Oil Interceptor or Grease Trap. It is a tank installed between a sink and a public sewer to prevent pollution from trade waste such as grease, fat, oil, silt, sand, sludge and other substances entering into the sewer system. A grease trap has a number of baffles that slow the flow of warm/hot greasy water allowing the water to cool. As the water cools, the grease and oil separate and float to the top, solids settle on the bottom and the cleaner/cooler water flows out to sewer. For more information, click here Viking Plastics manufacture standard and custom size grease traps. Viking has been supplying the Australian plumbing industry for over 50 years. For your competitive, no obligation quote, call Viking Plastics on 03 9587 2297.