TS Aquatics - Aquarium Check Valves, 10 Count

Keep your aquarium equipment safe with our aquarium check valve! Designed to prevent water from siphoning back through your airline tubing into your air pump, this small but vital accessory can save your pump from costly water damage.
 
Simply install it inline between your air pump and airstone or other air-driven equipment. The one-way valve allows air to flow freely in one direction while blocking any reverse water flow - giving you total peace of mind.