No matter how well maintained, laser tubes—like light bulbs—are temporary parts that eventually burn out. Replace your old tube with OMTech's heavy-duty H1 laser tube. Made of tough borosilicate glass, this durable 70W CO2 laser tube leaves competitors behind. Designed for medium-sized CO2 laser engraving machines, it is 3'7" (1100 mm) long and 2.3" (60 mm) in diameter. It installs quickly and easily: just wrap your power supply's connecting wires around the anode and cathode's connections and hook your water cooling system to the pipe fittings at either end.