Can't work out what waste water connector I need.

Phillippa42

changed my caravan to a Lunar Quasar and my old tubing for the grey water outlets into the wastemaster don't fit.

 

ive been and measured the outlet and the internal part of the hole is 32mm.  The measurement across the rim is 40mm if that makes sense.  I'm guessing the tube needs to fit over this rim rather than just push into the hole?  It's all very different to my
last one.

just looking online at waste pipe hoses and they all seem much smaller diameters?