This unit is very similar to the MGC215/225, but uses a different filter element which is open at the bottom and screws into a clear plastic receiver. The receiver tank is clear and you can see any water that has been captured and precipitated from the fuel. A tap enables you to drain this water away. The full system includes fuel filter head with mounting bracket, brass fittings, special water separating fuel filter and clear bowl. It is compatible with most outboards including Mercury and Yamaha. Almost unrestricted fuel flow.