Yellow and black fuel hose diameter: about 3 mm inside - 5.5 mm outside, suitable for engines with a 18 mm fuel tank opening. Hose length (black): 25 cm / 9.86 inches, hose length (yellow): 15 cm / 5.91 inches. Fuel filters are available for 2-stroke and 4-stroke engines. Note: The included fuel hose is not inserted into the fuel tank seal due to transport. Put a few drops of oil in the joint to make it easier to insert the fuel pipe. Fuel filter for hedge trimmer. Easy installation, please confirm the size before installation. General accessories for brush cutters The material of the fuel tank joint: rubber Fuel pipe material: PU Fuel filter kit fuel pipe diameter: about 3 mm inside - 3.5 mm outside for 18 mm tank hole. Package contents: 5 sets (fuel filter, fuel pipe, fuel tank rubber pad) Usually used for brush cutters for hedge trimmers.