I checked our files- you got the Sewer Genie and the hose reel from us (Pressure Washers Direct).
The description of the hose reel says it comes with 3/8" NPT (threaded) male inlet and 3/8" NPT (threaded) female outlet. The Sewer Genie spray gun has a male quick connect plug so at least one end of your hose is a female quick connect.
I don't know what's at the other end of your hose since we don't sell ElToro pressure washers, but if you check out our list of 3/8-Inch Adapters you should be able to find something that will mate the end of your hose and have a 3/8" male NPT (threaded) connection to mate with the outlet connector on the reel.