Fronius TTB 80 G Instructions De Service page 84

Fit the torch body:
Danger due to incompatible system components.
This can result in damage to property.
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NOTE!
Risk due to damaged O-ring on the torch body.
A damaged O-ring on the torch body can lead to contamination of the shielding gas, re-
sulting in a defective weld.
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Push the torch body locking device fully back and at the same time turn the torch body 180°
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CAUTION!
Only connect torch bodies and hosepacks that are using the same type of cooling.
Only fit water-cooled torch bodies to water-cooled hosepacks.
Before each start-up, ensure that the O-ring on the torch body is undamaged.
* Grease the O-ring on the torch body