I am selling two Rbta. Bought one at ACC and it has split, but they keep moving and smothering my zoas so I am selling both. Also for sale is a complete RKL with SL1 module. It does ot have aph probe. Each Rbta is $40 and RKL is $150. Please PM and I can get you a pic of Rbta. Sorry do not know how to upload pics.