This is a fuel shutoff valve / petcock. It bolts to the under-body of the the gas / fuel tank and servers to manually disable the flow of fuel to the carburetor. Long stem filtration tube. Used primarily for 5mm to7mm fuel line applications for any displacement, most commonly used (but not limited to) 50cc to 300cc ATVs, Dirt Bikes, gas powered Scooter, Go-Karts etc. Great addition for those machines that never came with a shutoff. A necessary part for those who want to have easy maintenance access to the carburetor. Valve length is 5cm and the mounting holes are 3.4cm apart centre to centre.