The black conductive rubber cuff is fitted on each end of the green and clear EOLO style hose in the second photo.
They also fit on the grey reinforced hose at the top of the 3nd picture.
These cuffs for this hose are a right hand thread. They screw on with a clockwise action.
Most hoses and hose cuffs are a left hand thread. That means, they screw on with an anticlockwise action.
At the moment standard postage within Australia, is capped at a maximum of $20!