Material：Made of Stainless steel, eco-friendly and durable material, wear-resistant and corrosion-resistant, for long-term use. Convenient to use: the water pump propeller is simple to use and does not require assembly; It can fit the original impeller well Mute：New interior noise dampening technology to reduce vibration generated by the machine. can be placed on any place for silent operation. Easy to replace： Simply remove the filter head, open the bayonet lock of the rotor cover, take out the defective rotor with axle and bearings and replace it with a spare rotor with new bearings. Special ring: prevent the motors from rubbing against each other, and play the role of mute and power saving