Since I had an assortment of Electrolux central vacuum power units and hose sets at hand, I wanted to share the similarities and differences as the product evolved through the past 30+ years. The power units as you will see have remained very similar. Electrolux/Aerus has only ever made one model at a time (first the 1580, then 1590, then several versions of the E130). The hose kits have always used the power nozzles and accessories from their canister vacuum cleaners, and I can't help but express my personal preference for the older style "pistol grip" hose setup vs the newer "gas pump" type that remains the standard to this day.