7 Pin towing socket

Without checking the manual I thought only the 13 pin sockets are testable.

The inspection applies to both 7 and 13 pin trailer sockets.

A 7 pin trailer socket will fail if its damaged or deteriorated where a connecting lead ( not the device lead for checking that the lights have been wired correctly on the 13 pin sockets) from its trailer (lead) can't be secured to it.
The manual gives info not to use the flap missing as a RFR proberly due coz its not damaged or deteriorated.
The socket can still be secured other ways so it dosent really need a flap or claw.

For electrical operation, yes ivor. but not for damage or wiring