Seven-pole sockets receive the trailer plug on the towing vehicle and pass lighting and signal current to the trailer. The spring-loaded lid keeps water and road dirt off the contacts when nothing is plugged in.

This category lists 17 Büyükdemir references cross-referenced against 24 original equipment numbers. The cross-reference tables cover Scania, DAF, Renault and Volvo parts.

Most looked-up references in this group: 7 Pole Socket / Steckdosen 3-3800, 7 Pole Socket / Steckdosen 3-0002, ABS / EBS Socket – ISO 7638 (GGVSE / ADR) 3-3600, 7 Pole Socket / Steckdosen 3-0120, 7 Pole Socket 3-0022.

Manufactured by Büyükdemir Otomotiv in Istanbul, a producer of truck and trailer air system parts since 1957.