Hose couplings for delivery purposes up to nominal size Storz 75 and for delivery and suction purposes (DS) up to nominal size Storz 38, are normally coupled and uncoupled by hand. For these sizes the torque is from 3 Nm to 8 Nm. From nominal size Storz 38 for delivery and suction operation (DS) upwards, and from nominal size Storz 75 for delivery operation, coupling spanners in form of onesided hook spanners with a long handle are used. The shape of the spanners allows complete connection of two couplings up to the stop, without having to reset the spanner. Please note the possibility of using Storz couplings of nominal size 100, 110, 125, 150 and 205 with ready-fitted coupling handles.