Rayin"S" posted:Wow! I had forgotten all about that thread, good info and I will add it to the pile. I did look at the Kadee site, l looked at the S and On3 couplers, not sure but it looks like they are very close in size.
Ray
The Kadee S and On3 couplers are identical except for the color of the uncoupling pin. I've used both interchangeably.
Rusty