English to Swedish Tech/Engineering Automotive / Cars & Trucks

Förekommer i en EU-text om typgodkännade av fordon.

Meningen är som följer:
metal pipes shall be joined with the use of standard self-locking cup or ring connectors, and the number of connections shall be limited to a minimum

Jag har tolkat det som att det rör sig om cup connections och ring connections som är self-locking. Men jag kan ju ha fel..

Sammanhang
7) metal pipes connecting installation elements which during vehicle use may be subject to mutual movement, shall be shaped in the form of a loop with a radius of curvature to fit pipe diameter;
8) pipes cannot be welded or soldered and joined with pressure-locking connectors;
9) metal pipes shall be joined with the use of standard self-locking cup or ring connectors, and the number of connections shall be limited to a minimum;
10) the external diameter of the rigid tubes used for liquefied gas shall not exceed 12 mm, and the thickness of the walls shall be at least 0.8 mm;