Algarde Non Return Valve

Algarde Non Return Valve This is an essential item if you are using an AIR PUMP and you need to place it lower than the surface of the water in your aquarium. It will prevent water from syphoning back into the pump in the event of the air pump stopping i.e. when you turn it off or have a power cut.

If water gets into your air pump it can be very serious.

It will fit standard airline/pipe/hose of 4mm inside diameter and 6mm outside diameter.