No there is no provision for float on the 70 series cases.
Back when I had one and was pulling a planter that sorta wanted one I think I found a kit to add it but the info on that escapes me now.
If you need it for something there are a couple of options. first to come to mind is adding a valve with float and running it off one of the outlets, just tie back the regular lever and use the add on for your control. Otherwise use your imagination.