Sell 10x One Way Check Valve for Aquarium Air Pump best price

Great one way check valve for aquarium air pump Protect you air pump by preventing aquarium water from back siphoning during a power outage. Small and compact / Made of durable plastic It's easy to install Compatible with standard aquarium air pipe of 4mm inner diameter These are great check valves for aquarium air pump. They can prevent the water in aquarium from flowing to the air pump. Full Length: Approx. 5.3cm(2.1 inch) Color: Red Package Included: 10 x one way check valve Note:Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.