O.S. engine FL-70 Owner's Instruction Manual page 20

Fig. 1 General Piping
No.1 Nipple (larger hole)
No.5 Nipple (smaller hole)
Fuel Fitter (commercially available)
T Nipple (supplied)
Plug (commercially available)
19
Note: When cutting silicone tubing,
use knife or razor blade.
Silicone Tubing
If you should need to clean out silicone
tubes, use methanol or glow fuel, not
gasoline or kerosene.
Fuel Stopper (commercially available)
Fuel Tank Center Line
Refueling
tubing
Do not use wire cutter
or pliers.
Carburetor
Center Line
Approx. 10mm