[Bailey'sMom]

Originally Posted by Padgett

As said it is a cigarette lighter socket but somehow TM found some that are about .1 mm smaller in diameter than an American lighter. I have just forced in dual lighter adapters with a bit of sanding on both and leave them there.

ps
12-volt cigar lighter receptacle and plug, size A
Receptacle inside diameter: 20.93 - 21.01 mm (median 20.97 mm)
Plug body diameter: 20.73 - 20.88 mm (median 20.805 mm)

12-volt cigar lighter receptacle and plug, size B
Receptacle inside diameter: 21.41 - 21.51 mm (median 21.455 mm)
Plug body diameter: 21.13 - 21.33 mm (median 21.18 mm)

Hard to put a 21.13 mm pug into a 21.01mm socket worse if other end of tolerance

Padgett, are you saying the dimensions of the two outlets in your trailer are different sizes or are you saying that that there are two different plug sizes made and they are distinguished by A and B? If the latter then presumably we could search the Internet for a matching plug size???