Package includes: 5 sets of fuel filters, including 5 black fuel filters, 5 yellow fuel filters, 5 2-hole gaskets and 5 primers, which can be used on multiple engines at the same time. Size: The inner diameter is 3.5mm and the outer diameter is 5.5mm, suitable for engines with a tank opening of 18mm. The length of the black fuel pipe is 26cm and the yellow one is 15cm. Type: Fuel filters are available for 2-stroke and 4-stroke. 2-hole gasket: The 2-hole oil seal can maintain a good seal. The grass trimmer fuel line is soft and flexible and easy to install the carburetor on the engines. Wide application: The fuel pipe is the perfect replacement part for many household machines, such as trimmer, lawn mower, chainsaw. Please check if the size of the accessory is compatible before purchasing.