I don't think they make them anymore. But ... you could probably hack one.
I discovered that the nozzle end of my ortho dial n spray pulls off easy. What's sticking out is about 1/2 inch wide. Find a pvc adapter that will fit over what's sticking out to whatever size hose you are using, say 5/8 inch. You want the larger end to be threaded.
You'll need to use a heavy duty glue like a 2 part epoxy specifically for plastic to attach the adapter to the hose end sprayer. I think this would work for you.
