Agilent Technologies 5975T LTM GC Operation Manual page 126

4
General Maintenance
Wear clean, lint-free gloves to prevent contamination of parts with dirt and skin oils.
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Clean the inlet if there is visible or suspected contamination. (See the
Agilent 5975T LTM GC/MSD Troubleshooting and Maintenance Manual.)
Clean O-ring residue from sealing surface.
5975T LTM GC/MSD Operation Manual