Royal Upright Hose...
What also gives it away as a dead ringer that's an upright kit every time is the round metal "standpipe", that is smack dab center of your photo. Thats the converter you plug into the suction opening of the fan chamber, thence you attach the hose to the opposite end of that. It completely surrounds the belt pulley and while not quite an "airtight" seal, it was actually one of the better devices to create a "tools available option" for an upright vac.
I would say in terms of contemporary cleaning ability, they were FAR better than the rear converter Hoover Convertibles, the later Power Seal Converter pan sets, The Eureka tool sets, with their standardized pan style converter. Even with their ESP models suction really wasn't that good. The only one I think that really surpassed this design in functionality and suction ability is Kirby..but not by much and a genuine early "Panasonic" Jet Flo style bypass upright which gave the first real canister strength suction in an upright design. Yes we could also consider the Dialamatic for a moment...but I've owned both, and in suction power, the Panasonic's win hands down of the the Dialamatic suction.
It's a nice kit tho from what looks to be the 880 series of machines when royal was going thru their BLUE phase...lol
Chad
AA Mi
