Kärcher 397 M plus Operating Instructions Manual page 13

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The high pressure hose of your Karcher Pressure Washer should not
be mistreated. It is designed to withstand high pressure operation so
vehicles should NOT run over it, nor should it be pulled across sharp
or abrasive edges. These actions may weaken the hose and cause
ballooning.
IMPORTANT
REMEMBER FROST WILL DAMAGE YOUR KARCHER
PRESSURE WASHER IF IT HS NOT BEEN COMPLETELY
EMPTIED OF WATER AFTER USE. ALWAYS STORE IN A
FROST FREE AREA.
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