When opened to allow gas flow the hose cannot be disconnected until the valve is turned off.Kit Includes:- 1/2in diameter hose- 1 Safety Quik quick disconnect valve combination- 1 elbow This 24in kit comes with a 1/2in diameter Dormont blue hose with the first and only quick disconnect valve combination on the market to make your place of work and your appliances safe..The Safety Quik valve employs a number of safety measurements while acting as a convenient quick disconnect fitting.