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Glass non return valve for the prevention of back flow of water to either C02 equipment or air pumps. Essential piece of equipment for any planted aquarium. Compatible with pressurized Co2 tanks & DIY yeast bottles. C02 set up should be: solenoid > non return valve > bubble counter > diffuser. Colour may vary from red or blue. Date Added: 01/08/2010 by Glenn Eldridge
does what it says on the tin. works well though!
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