A lever arm coupling for detachably connecting hose lines has a first connection part and a second connection part, the coupling operable by way of at least one lever arm. The lever arm comprises a pressure application section that is mounted pivotably about a pivot bolt that defines a pivot axis, the pressure application section reaching through a radial opening into a receptacle space of a receptacle housing. A securing disk is pivotably disposed on the pivot bolt parallel to the pressure application section. The securing disk is mounted pivotably between stops at the second connection part and can be carried along with the lever arm, wherein a pivoting of the securing disk can be executed in such a way that a secured pressure release position of the lever arm coupling is attained.