For drainage, sewage, fertilizer, and more. Dual volute design means faster priming and eliminates priming valves and jets. Self-cleaning and flushing action design to minimize settling and clogging from debris. A double seal means double life and double dependability in this most critical part of your pump. A dynamically balanced trash-type impeller results in minimum end thrust and maximum seal life by keeping mud and sand sucked away from the seal. Large free flow built-in check valve on all pumps. No need for a foot valve. Ohler pumps are built for years of reliable and hassle-free operation.