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

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

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

Festo plug with 4 mm automatic coupling to close systems

Festo Filter for kerosene gas systems with external diameter 6 mm tube 

4mm quick-fit locking cap for kerosene gas air systems for airplanes and helicopters RC

Festo tube 4 mm transparent outer diameter 2 m

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

Festo tube external diameter 3 mm blue color length 2 mt

Festo L-coupling with 3 mm quick couplings