PURPOSE:In an indicator for indicating the pressure container under usage in a plurality of pressure ocntainers interlocked with an exchange cock, to prevent projection of arm by employing an arm interlocked with the exchange cock and a spring. CONSTITUTION:Pressure containers 2, 3 are used alternatively through exchange of cock 4 handle 5 fixed with an arm 13 through a shaft 12A while a tensile spring 16 is stretched between the arm 13 and the handle 5. The arm 13 is provided with a stopper 17 which will collide against the bolt head provided on the pressure containers 2, 3 to perform positioning. Consequently, it can be indicated which one of the pressure containers 2, 3 is under usage through exchange of the handle 5.
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