This device is for airplane modelers that have their engines and fuel lines in hard to get at places such as cowlings.
Features: One-piece valve assembly installed into airplane with convenient fueling probe for refueling
Overall length (front to back): 13/16 (20mm)
Mounting nut diameter (what is seen on outside of cowl): 1/4
Hole size (drilled through cowl): 3/8
Length inside cowling: 1/2
Note: Will require drilling 3/8 hole for acceptance of valve assembly. This will only work with gas fuel or smoke oil.