Close-coupled, self-Priming pumps with liquid side channel and star impeller Single Stage Pumps - SP Close-coupled self-Priming pumps with liquid side channel and star impeller. Designed to remain primed even in the presence of water-dissolved gases or when the suction line is not filled with liquid. The Nickel-plated brass impeller avoids possible jamming due to oxidation. Specifications Delivery: up to 2.75 m³ / h Head: up to 50 m Power supply: both single and three-phase 50 and 60 Hz Power: from 0.55 kW up to 0.75 kW Maximum operating pressure: 8 bar Temperature of pumped liquid: from -10 ° C to 40 ° C