Strange Plarail Coupling?

Recently I purchased a lot containing lots of plarail Thomas models, inside was a plarail thomas with an odd coupling, like the standard coupling except there was no slit at one end, both ends are circular loops with no slit in either, does anyone know what kind of coupling this is? Is it rare to have one like this? Any information would be greatly appreciated!

do you have photos of the strange coupling?

Is it hard plastic or rubber?

Just to be clear, it’s not the Made in Japan style coupling, right? There’s no slit whatsoever on either end? And yes, photos would be great

Sounds like a McDonald's coupling to me

Yeah I'm pretty sure that it is a McDonald's coupling, taking a look at them both, here's a photo:

Yep that’s McDonald's!

Ah, thank you, not sure what caused it to get onto this thomas but I think i'll keep it as an oddity

i say the former owner swapped it out of the Mcdonald couping to fix the thomas you had.  I had a green express coach with yellow wheels.  

After discussing on here, I have concluded that the wheels came from other rolling stocks he/she owned.