Leak free pumping without the need for magnetic couplings or mechanical seals. Consistent performance, minimally affected by fluctuations in pressure and viscosity. Self-adjusting for mechanical wear. Excellent self-priming and line-stripping capability. Dry run capability. Outstanding price / performance ratio. Excellent self priming. Ability to run dry. Strong suction lift (ability to clear the pipes). Not affected by viscosity variations and pressure. Fast and easy maintenance.