Goodridge cutter style fittings are special parts made from a strong metal that can be used again and again. They are made to fit special hoses for fuel and oil called Goodridge 200 and 210 series hoses, but they can also work with Aeroquip AQP and Startlite hoses. These fittings are made very carefully to be really safe and have three seals and two rings to make sure they connect tightly and don’t leak. Goodridge hose ends have a special design that lets them move in any direction, like a swivel. They also have a shiny red or blue finish. This can be used safely with fuel, oil, coolants, methanol, and water.