Aftermarket Nilfisk Advance 56370711 Thumb Nut
Squeegee thumb nut knob. Fits Nilfisk Advance 34 RST, Adgressor, BA 750ST, BA 850ST, CMAX 28ST, Covertamatic 24-32, Hydro Retriever 2800, Hydro Retriever 3800, SC750, SC750ST, SC800, SC800ST, SC900ST, SC901Fits Aftermarket Nilfisk Advance 56370711 Thumb Nut
This part was the right size only wished I paid attention and ordered the washers as well because it won't work properly to keep the squeegee attachment on without them. In fact they ought to be sold together or that part recommended when ordering this one.