Presto P3 Spring Load Levelers

The P3 Spring Load Leveler automatically adjust the height of a pallet load as boxes are added or removed. It has a built-in turntable ring which allows workers to spin the load so they are always working at the near side and never have to walk around the pallet.
The P3 Spring is completely automatic and requires no power or air. It can be used with loads from 400 - 4500 lbs.

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Wait isn't this originally a southworth product?