Barnes SE51AU, Part #104873, 1/2HP, 120V, Automatic Sewage Pump with 2″ Discharge Barnes SE51AU Specifications Barnes engineered sewage ejectors pumps are available in 1.5″,2″ & 3″ discharge, for residential and light commercial wastewater applications. Heavy duty cast iron construction Rugged, oil filled NEMA motors Integral mechanical float switch 20′ cord