Birchmeier Flox 2.5 Gallon Backpack Sprayer is a little more than a pound lighter than the 15K. Also, the tank size is different. Othere than that they are very similar both with a year warranty.
If the 4 gallon Birchmeier you purchased then yes, the Birchmeier Flox Backpack Sprayer 2.5 Gal would weigh a little less and might be a better option for you.
The Birchmeier Flox Backpack Sprayer 2.5 Gal. is not battery powered. It is pumped manually. Â
There are tank markers on the Birchmeier Flox Backpack Sprayer 2.5 Gal. and you should be able to see the amount of water left in the tank.  Operate the pistol valve (23) and generate pressure by means of a few strokes on the pump lever. Maintain the pressure by operating the pump lever periodic…
Read Full Answer »The Birchmeier Flox Backpack Sprayers come assembled for the most part. You may have to put the straps on and adjust them yourself though.
Unfortunately the Duro Mist 1.5mm Nozzle that comes on the Birchmeier Flox Backpack Sprayer 2.5 Gal only puts out a mist spray pattern and does not adjust. The Adjustable Nozzle (Part 28502598) will go from a wide fan to wide cone spray, but not pin stream. We recommend contacing Birchmeirer direc…
Read Full Answer »Yes, we do carry the The Birchmeier Handle (10392201) that can be used with the Birchmeier Flox 10 l (2.5 Gallon) Backpack Sprayer (10956104).Â