Essential Guide: Key Points To Remember When Replacing A CO₂ Laser Tube This guide explains the essential steps for safely replacing a CO₂ laser tube, from draining the cooling system and checking water flow to wiring, mounting, alignment, and first-time testing. It also includes factory-recommended best practices from Puri Laser to maximize tube lifespan, power stability, and cutting performance. Ideal for users upgrading or maintaining 100W–150W CO₂ laser systems.