Step1: Turn off the unit and allow all pressure and hot contents to fully release.
Step2: Close the draw-off valve and remove the existing handle, bonnet, and damaged stem assembly.
Step3: Inspect and clean the valve body and sealing surfaces before installation.
Step4: Insert the new stem assembly carefully into the draw-off valve body.
Step5: Reinstall the bonnet and handle, tightening components evenly without overtightening.
Step6: Test the valve for smooth operation and check carefully for leaks before returning to service.