Waters Xevo G2 QTof Operator's, Overview And Maintenance Manual page 172

6. Use the needle-nose pliers to carefully swing the ring terminal tags out
of the terminal block.
7. Use the needle-nose pliers to gently grasp the heat-shrink tubing on the
heater cartridge assembly and slide the assembly out of the ion block.
Heater cartridge assembly
5-96 Maintenance Procedures
Ring terminal tag
Heat-shrink tubing