Still not sure what you mean, but if it's the two halves of the connector between the hose from the trailer and the end of the hose from the pole, they should just push together. The bit with the "bearings" inside it tell me it's a standard bayonet fitting. Push together to connect, pull back the brass sleeve to disconnect. If they don't, then you've got two different types of fitting and they won't join.
Cheers,
Ian