RE Lutz pump tubes in either stainless steel or polypropylene.
GERMAN PATENT: DE 37 18325 C2
They do not only protect the environment, but also help to save money.
Liquid is used to the maximum
"To the dregs" less than a 100ml remaining
Reduced cost of residue disposal
No drain back when changing drums
With the motor running, the pump foot is closed by lowering the sealing foot within the pump tube. The sealing cap locks the pump foot and prevents the entered liquid from flowing back into the drum. Closing is done in no time at all by rotating the small lever below the hand wheel.
With the motor switched off, the pump holding the liquid can be removed from the drum with all the valuable liquid trapped within the pump tube.