Dubro valve mounts to the model and a special probe is used when fueling. With the fuel valve you don't have to disconnect any fuel lines to fuel the model. The valve and probe are color coded Red to signify they are for use with gasoline
Valve's diameter thru fuselage: 1/2"
Fits: 1/8 or 5/32 ID fuel tubing
Valve length: 1 3/8