This has been on here before-so here goes-can't ever narrow it down to one vacuum-that is another reason we collect them.NSS M1,Sebo D4 Premium,MeileS8 UniQ,Riccar 1700,1800,Rainbow Black,Any metal Royals,Most Kirbys-esp when mated with my NSS M1-like those so much---have three.Bet they will outlast me.