Joining connections are presented for joining the functional parts of hydraulic or pneumatic operating devices the joining connections including a first part exhibiting an external wall section and a second part exhibiting an internal wall section, which are joined together with mutually overlapping wall sections having depressions that form a cavity, in the connected state that is filled with a fluid casting compound of plastic that connects the two parts together by means of a positive form fit after hardening to prevent relative displacements between the two functional parts and to seal the separating gap clearance between the wall sections of the two functional parts.

 
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> Double walled containment sumps

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