Samsung WW12T Series User Manual page 25

Aqua stop hose (applicable models only)
A
NOTE
The end of the aqua stop hose must be fitted to the water tap and not the machine.
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The aqua stop hose alerts users of a risk of water leaks.
It senses the water flow and turns red on the centre
indicator (A) in case of a leak.
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2020-12-28 ˜˜ 5:56:20