Gases Oxygen GOX 20bar Blue – Semperit Acetylene GAC 20bar red – Semperit Twin hose oxygen and acetylene 20bar – Semperit Oxygen and Argon welding hose Welblu 20bar Tubi Gomma Torino LPG and CNG Welorange 20bar Tubi Gomma Torino LPG – natural gas 25bar Alfagomma