Upright dyson sucks through the hose but not through the base?

Hi there,
my upright dyson (I think its an 07 animal) has stopped picking stuff off the carpet unless I use the hose. It seems to be the little connector that switches between the two. This doesn't snap into place anymore when I use the base (might loose suction there?). Can I replace this part?
I have checked all other airways and nothing is blocked or torn...

Heikes
May 2009