One Way Check Valves Bulk Pack of 50

Check Valves should be fitted in the air line approx. 6” (150mm) from the air pump and are designed with a silicone one-way reed-type valve so air can flow to your equipment in the aquarium without too much restriction.  In the event of a power failure, water can syphon back down the air line into your pump, causing damage to the pump and electrical shorting.  These simple one-way check valves stop the water before it can get to your pump, so preventing any water damage.