This is the hose that goes from the valve output to the back of the gun to power the RT trigger. Need a new hose? Why be like everyone else. Now, from TippmannParts.com, you can get this hose in cool colors instead of black. Choose your color to make a statement. Or… um… just get black. You know, like a Ninja! Note: The hoses are cut slightly long. You can cut them with a razor blade to the exact length you need. Some players want to upgrade to this 1/8 inch hose. That can be done for better air flow as long as you make sure to get the 1/8 inch ID hose and 1/8 inch ID fittings too. These hoses might have specification numbers in contrasting colors. When installing, face lettering towards marker for solid color consistency.