Bottom Drain With Air DiffuserThis drain works very well in fish and koi ponds as it provides aeration while improving the bottom-cleaning action of the drain. Induced current from rising bubbles draws sediment into the drain. It has a 3/4" FNPT air supply connection and the cfm range is .5 to 1.5. It is an adaptation of our D3 drain. Note: Diffusers are also known as airstones. |
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