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Sealing system: Mechanical Seal MS or Sealless SL

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Mechanical Seal = MS

Usage: Pump tubes with MS are recommended for crystallizing,
hardening and solid containing liquids.

Sealless = SL

Usage: In all other cases you should give preference to sealless design because a sealless pump cannot fail by running dry.

glrd

dl

...not be allowed to run dry!

...can briefly run dry!

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More Information:

Link:
http://www.lutz-pumpen.com/desktopdefault.aspx/tabid-46/232_read-302/