Pearl Mini-Sub 4" Effluent Bottom Suction Pump 1/2 HP, 115/1/60 # 4MSP05-A16S. Multi purpose applications in the residential, agriculture and industrial markets. Perfect for pressure boosting applications, irrigation and water transfer. Continuous duty: PEARL EFFLUENT pumps can operate continuously without damage to any component. Impeller Floating System: designed to guarantee the best performance and durability for sand handling. PERFORMANCE RANGE: Flow from 2.5 GPM to 25 GPM. Head up to 172 feet. Weight: 18.5 lbs. Construction Materials: Discharge: Technopolymer. Pump Bearing: Nylatron. Check Valve: Technopolymer. External Sleeve: Stainless Steel 304 Polished. IMPELLERS: Acetal. DIFFUSERS: Polycarbonate. WEAR RING: Polycarbonate / Stainless Steel 304. Shaft: Stainless Steel 304. Suction Grid: Stainless Steel 304.