ok looked everywhere, who knows what diameter hose i need to replace the piece that goes to the top of the dv valve, since fitting  the oversize tip mines too short, 

 

i see it looks narrower on the dv than where it goes to anyone have any input?

4mm ID from memory

4mm seems ok for the Dv. But the other end is a lot wider .

i think its about 6mm inside diameter hose you need 

that probably sounds about correct