Festo fitting straight with reduction to quick couplings diameter 3-4 mm for kerosene air systems of RC helicopters or airplane 

Festo fitting straight to quick couplings diameter 4 mm for kerosene air systems of RC helicopters or airplane 

Festo plug with 4 mm automatic coupling to close systems

Festo fitting straight with reduction and quick couplings 4-6 mm for kerosene air systems of aircraft and RC helicopters

Festo tube external diameter 3 mm blue color length 2 mt

Festo L-coupling with 3 mm quick couplings

Festo L coupling with quick-release 4 mm couplings for air and kerosene systems on airplanes and helicopters

Festo tube external diameter 6 mm transparent color 2 mt

Festo ball valve with 4 mm quick couplings for kerosene air gas systems of rc models

Festo tube 4 mm transparent outer diameter 2 m