I also noticed that here
http://www.jlaquatics.com/phpstore/s..._ID=ro-kpfvkit
"The Float Valve Kit allows an RO to fill a reservoir to a desired level, then shut down water production completely.
This kit works from pressure only, no electricity.
Included within this kit is a pressure solenoid, float valve, check valve, a 1/8" elbow, a male 1/8" x 1/8" connector and 1 foot each of blue and orange tubing.
Not recommended for level control in aquariums."