Fuel tank Kovea Screw Type Camping Gas 230G-high performance and minimal consumption. The original gas canister Kovea Camping Gas screw type, provides a high efficiency through the use of a mixture of two combustible gases – isobutane and propane. Operation temperature of the mixture is from 40 to -23 degrees. Propane provides high-pressure gas while maintaining system performance when used in low temperatures. Isobutane maintains stable pressure in the tank when the fuel in it at the end.