Brand New $300 shipped.
I have an extra one and never used it. From my research, TMC UV Sterilizers have one of the highest efficiency and dwell-time for killing parasites and sterilizing your water.
You can purchase future bulb replacements from here...
Clear Blue Quartz Cap
EZ-Twist Cap—Quick and easy quartz sleeve maintenance
Quick Release Unions—Remove the entire body without any dismantling your plumbing
Great for reef tanks up to-75 gallons
Suggested flow rate for saltwater aquarium sterilization—233 GPH
Mounting brackets included...