Koi Fish Feeder,Deal12B,KSF-2XL,Hopper,Otdr Adapter,ACAT-32 Timer,Wire. MSRP: $231.29. $169.00. Free shipping plus 5% off on all Super Feeders! Mount this Koi feeder to a piece of 2x4 hung in the air using a metal pole or wood post or a vertical 2x4 in a bucket filled with concrete and placed in the water.