Both C and Palm couplings are for the air line connections between tractor and trailer.
C type couplings are typically used in the UK. These comprise a collar which snaps into place.
Palm couplings are used largely in the remainder of Europe.
Operators wanting to connect a UK tractor unit to a European trailer (or vice versa) may want to use an adapter.
Published: Fri 17 Nov 2023
Updated: Tue 09 Jan 2024