I thought that only the PN5 had the spring-loaded wheels. Did all the Epic Series color versions have them or just the dark gray ones?
Here is information I've collected on all the Aerus/Electrolux power nozzles (except the Canadian-exclusive models). It's a work in progress given the fact that I haven't confirmed all the data and don't have all the facts such as the spring-loaded wheels on the Epic Series model, but it provides a framework. There are 60 models in all plus the 3 dry chemical carpet nozzles (D series). To save space I just included the cylinders' model IDs without their names (used since 1974), so some PN models had several different hoods, because the same cylinder model may have had different names (e.g. Model 2100: Hi-Tech, Special Edition, Regency Series, Diplomat). In addition, the PN-1 underwent several color changes to match the different cylinder colors with which they were paired; and the commercial version even had a detachable elbow that the domestic version did not--none of this information was included). I'm unsure which models came with the double helix brush roll, or when it was made available as an option.
I'm thinking that the uprights that were sold concurrently with each cylinder would have used the same power nozzle; others who have worked on them and/or sold them can corroborate or refute that.
Incidentally, these are the Epic Series PNs according to my list: *N106M, N109s, and *N137A. (*also paired with other cylinders)
•PN-1s – PN-4s (STANDARD & COMMERCIAL MODELS): rectangular-shape, metal elbow riveted to wand (PN-1s), wand-lock standard elbow (PN-2s-4s)
brush roll options: PN-1—domestic two-row brush #10368, three-row #10371 (commercial) soft brush two-row #10376; PN-2—two-row domestic #41920, 3-row (commercial) #41921, two-row soft brush #41940; PN-4 & PN-4A—two-row brush (domestic) #42071, agitator brush (commercial) large dowel #42074 and soft two-row brush #42067.
•PN5s, PN6s, & PN7s (STANDARD & COMMERCIAL MODELS): L-Shape “Omni-Flo Automatics”, on/off/reset switch, standard elbow
•factory-equipped 3-wire models: PN-3, PN-4C, PN5C, 6BC (renamed N116B), 7BC (renamed N116A), 1751?
•1622, 1720s, 1751 (ECONOMY MODELS): L-Shape, on/off/reset switch, standard elbow
•1684, 1690s, 1750 (STANDARD MODELS): L-Shape, headlight, on/off/reset switch, std. elbow
•N115s (ECONOMY MODELS): L-Shape, headlight, power switch, reset button, standard elbow
•1752, N116s (Model CB2000s: L-Shape, power switch, reset button, “Omni-Flo Automatic”,
standard elbow
•N106s, N109s N137s: L-Shape, headlight, electric elbow; reset button; hose grip controlled
•N142A: L-shape, headlight, electric elbow, black reset button, hose grip controlled; HPO brush roll
•N144A (INDIRECT SALE MODEL): L-Shape, reset button, electric elbow
