You can go to their web site and get their PH # and give them a call. They are very easy to talk to. I did so when thinking of up grading my Ref 20. They told me the price and what was involved. I will be getting the ref 50 instead of doing the up grade. Oh! I have their number. 1 800 543-5252, in NY 716 656-0026
Hope this helps
Gary
Hope this helps
Gary