The Watts LPSOV Leak Protector is more than just a leak detector. When the LPSOV detects that there is a leak, the adsorbent pad inside the leak protector expands to close the valve. This shuts off the water flow and stops the leak. 

This kit includes: Three (3) total adsorbent pads: one already in the leak detector, and two in a replacement pack. We offer more Replacement Adsorbent Pads in two (2) Packs if needed.    System Add-On  For use with under counter reverse osmosis and drinking systems.  
Detects Leaks  Shuts off flow in the event a leak should occur protecting your equipment.
Easy Installation  Simply steps to install or replace the protector and pads.
Novel and Effective Technology. The patented device is novel, but quite simple. When a leak occurs, the adsorbent applicator “tablet” expands to close the valve and shut off the incoming water supply.
Cost-Effective Investment. For less than $20, you can ensure that you will not suffer from damaged property due to a leak.
CAUTION: Keep Leak Protector Replacement Cartridges (pads) out of the reach of children.