Check the listing for details. 2-Pack 17mm expanding pads for Reverse Osmosis Leak Detector / Protector Valve. Color: White, Condition: New. Listed at 9.50 USD. This listing includes 2 pads only? NO leak detector is included. 2 pads ONLY for our leak detector eBay item # 162013458723 as showing belowVery Simple and Effective Leak ControllerThis innovative water leak detector uses a lever trigger mechanism to shut off incoming water in case of leak. An absorbent expanding pad is fitted into the device and when water comes into contact with the material it will expand in size. This will flip up a lever that shuts off the incoming water supply.This leak detector is completely maintenance free as it does not require electricity or batteries. It can be easily installed on any surface with a simple screw and adhesive pad but it should be placed close to where a water leak may pool near the water source. This detector works well with reverse osmosis and other water filtration systems. Package Includes:· Quantity 2 New Replacement Expanding Pads Only (Each pad size: Diameter 17mm , Height 1 CM ) We are not responsible if this pad doesn't fit your detector or its for anther brand detector or from other seller. this item is final sale " no returns "