Installed between the tank and the fuel filter, the fuel decontaminator unit continuously cleans the fuel offering a permanent solution to the problem of micro organisms in the fuel. QL fuel decontaminator works through a patented magnetic system. When the fuel passes through a system of magnets the micro organisms are killed and broken down to small particles that easily pass through the fuel filter and then burn in the engine combustion.* Includes 2 nipples 1/4" for 5/16" fuel hose.** Nipples not included.