Algarde Airline Non-Return Valve for 4mm Airline
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This non-return valve is easy to attach to your airline. Prevents water being siphoned from the airstone back into the air pump when it is turned off. It is recommended that any air pump situated below an aquarium is fitted with one of these. The Algarde air hose connector is made of strong plastic.
Fits standard air line (4mm inner 6mm outer diameter).