Have added them to my business contacts.
I've only been using them for a couple of weeks but the fit is good and they are as good as OEM.
1.50 Inch vacuum hose assembly. Fits Nilfisk Advance Convertamax 20/26, Hydro Retriever 2800 (sn 0-1608879), Aqua Clean, ConvertaMax
Fits Aftermarket Nilfisk Advance 56392170
This part is listed as fitting the following models: