Gascolator is a high quality, low cost fuel filter and water strainer. It should be installed at a low point in the fuel system, below the fuel tank to trap any water that may accumulate so it can be drained. The gascolator has a 10 micron fuel filter and an 1/8" pipe thread outlet for a quick fuel drain valve (Curtis Drain Valve not included - info below!). If you are using a fuel pump, the pump should be installed between the carb and the gascolator. Has 1/4" pipe thread for fuel in and out. Replacement parts available.