Joints EYRBALL make it possible to ensure the sealing between two variable components. Realized starting from welded extruded profiles then, they consist of a inflatable elastomer envelope by a valve. In at-rest state or retracted, the joint authorizes the displacement of the variable component. In a state of work or expanded, it ensures the sealing between the interior and the outside of the mechanical system and blocks the variable component.

The Group Eynard Robin manufactures and distributes:
- joints EYRBALL High pressure: for a strong pressure to be sealed (from 4 to 5 bars) and a weak running clearance (from 1 to 5 mm)
- joints EYRBALL Low Pressure: for applications to low pressures (from 2 to 6 bars) and big game of operation (from 3 to 20 mm).