Here's my original question

Can anyone with one of these power sockets on the exterior of their T25 confirm that a standard caravan female couple will plug in to it? Reason I ask as I would like to make a longer lead you see, but here the cost of these Defa plugs is shocking, and if a female caravan couple will fit, job's a goodun.
Male plug on my Syncro.. (Not visible is the notch near the large round pin).
Female caravan coupler
Thanks