Based on these principles of operation, it can be discerned that a pump impeller's rotational speed (affects velocity) and vane height (affects pressure and the possible formation of a vacuum) largely ...

We tried the DR Leaf and Lawn Vacuum, and it's the fastest, most convenient way to keep your yard free from debris all season ...

This self-propelled vacuum features a powerful, stellar impeller and unique EZ Bagger Leaf Collection System to engulf up to ...