The 50 mm hose fits straight into the nilfisk vac all I will be doing is putting some silicon around it to make a flush fit. I have also designed a pole joining section which helps the poles fit tightly with out coming apart.. I am making a strap to fasten these PVC drain tubes to my SLX so when IT going to third floor It will still be secure and not collapse at this height.I will try and get some pics on here.(WITH SOME HELP)THE DOWN PIPES( 50MM) )FROM b& q ARE THE BEST ONES TO USE.I HAVE ALSO BUILT A 70MM ONE BUT PREFER THE 50 MM.I WILL BUILD A JOINER PIECE OVER THIS NEXT WEEK AND TAKE PICS OF EACH STAGE.