BOTTOM DRAIN BOTTOM DRAIN $51.25 SKU: TET16360 QTY: Click here to save 5% off of your order! BOTTOM DRAIN Installed at the deepest point of a Koi pond, the superbly engineered device encourages debris & waste to flow into a circular collection chamber, where it is then carried away underground, via standard 3 PVC pipe (not included), to a disposal area away from the pond. It's dome-like shape is designed to force debris and waste to flow into the collection area. Made of high impact, climate proof plastic. Includes instructions and accessories for installation.