Hydrotech Classic Series Stenner Basic Service Manual - Manual (Page 14)

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TUBE (wear part)
How it works
The tube is squeezed by two of the three rollers that move
along the tube. As the roller moves, the compressed section
generates a vacuum, creating a self-priming function. The
remaining two rollers repeat the process and the rotation
creates a pumping action.
Section IV Maintenance Basics – Tube