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Algarde Non Return valve is an essential piece of equipment, to avoid back siphoning of water from your aquarium. Date Added: 28/12/2010 by Angus Trelawney-hardy
 nice little non return valve, solid construction and glueing is great compared to other small non returns which ive had pop open due to CO2 pressure, i also like the membrane system as it is really easy running compared to other brands.
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