Check the listing for details. 2PC Professional Rid-Volt Titanium Aquarium Grounding Ground Probe w/Suction Cup. Condition: New. Listed at 17.90 USD. FEATURE • FOR ALL FRESHWATER AND MARINE AQUARIUM • Removes harmful voltage released into the aquarium by electrical equipment • Features noncorrosive titanium probe with 10ft. Wire lead • Easy to install. Just plug into grounded wall socket • This package contains 2 packs of Titanium Grounding Probe DIRECTIONS 1 - Using the suction cup, affix probe to the inside back of the aquarium or sump so that the titanium part of the probe is submerged. 2 - Plug into grounded wall socket or attach the terminal connector to a suitable ground such as the center screw on the electrical wall outlet plate. 3 - It is important when plugging into the grounded wall socket or attaching the terminal connector that you position the wire in a loop below the end connection to avoid water running down the wire to the connection point.Aquarium Grounding ProbeRID-VOLT gives you a positive electrical ground for your aquatic systems. When properly installed, RID-VOLT will remove "Stray Voltage" generated by pumps, heaters, lights, and other electrical devices used by aquarium, live seafood tanks, ponds, etc. RID-VOLT protects you and removes unwanted stress from your aquatic friends.