difference between butane and propane gas
For the caravanner, two types of LPG are generally available - Propane and Butane. Propane canisters are invariably red, and use a universal type of connector. Butane canisters vary in colour from supplier to supplier, but are most commonly blue. The connector for Butane also varies between manufacturers, with some (for example, Calor) using different types of connector on different sizes of bottle.