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Environmental Function Control (EFC by OASE) protects against dry running and blocking
The pond water may appear slightly milky
Size: 55cm
Gives rapid breakdown of food and fish waste
Flapper Valve Non - Return 1" (inc split unions) Environmental Function Control (EFC byDouble Union Flapper Non Return Valve Very Reliable Double Union Flapper Non Return Valve, this Double Union Flapper Non Valve has minimum resistance also with the advantage of waste particules that can be removed by unscrewing the double union fittings. The Double Union Flapper Non Return Valve provides a simple means of preventing backflow in pipe work where this would be undesirable i. e in pumped systems or where Elecro heaters are fitted in line.
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