What is the purpose of a water box on a piston type concrete pump?

The purpose of a water box on a piston-type concrete pump is to provide a reservoir for water, which is used to lubricate the pump's piston and prevent concrete from sticking to the internal components. It helps maintain the pump's efficiency by ensuring smooth operation and reducing wear on the parts. Additionally, the water box can assist in cleaning the pump after use, making maintenance easier and more effective.