Grundfos SEG.A220.127.116.11M Grinder Pump. The SEG Series Pumps are specifically designed for pumping domestic sewage, effluent and untreated sewage and other liquids. This SEG Pump is ideal for fully submerged continuous operation and or partly submerged intermittent applications. Note, for longer pump life, and better performance, avoid mechanically wearing particles or abrasives such as sand or gravel. The Grundfos SEG.A18.104.22.168M Grinder Pump is a cost-efficient system that maximizes protection for the surrounding environment and reduces energy consumption. The Grundfos SEG.A22.214.171.124M Grinder Pump has a few additional key features and benefits that include; heavy-duty ball bearings, a cable plug connection, SmartTrim impeller, specially designed lifting handle, and unique cartridge shaft seal.