Metpure ALD14 Leak-Lock Auto Shut-off Water Leak Detector for RO/Filtration Systems- Discontinued Prevents costly flood and water damage. 1/4" quick connect for easy installation. Includes 2 super cellulo sponges (1 pre-installed), mounting screws, double-sided tapes, and manual. Mechanical operation- no electronic components, batteries, or electricity required- very reliable. Easy to change cellulo sponge allows the detector to be reused. Use sponge part number 14-LPS4-PAD.