Current Culture DOK Multi-Mod Drain Out Pump KitThe UC Multi Mod Drain Out Pump Kit Accelerates Nutrient Change Outs. NOTE: This multi mod drain out pump kit is designed to be used to expand the new 2019 multi mod under current systems. This drain out pump kit will NOT work with the classic systems. If you are looking to expand an old classic under current systems, please call us for more information and pricing. The UC Multi Mod Drain Out Pump Kit attaches to the Under Current Systems Drain Out