This is a Genuine Viqua replacement UV lamp and Sleeve. This UV lamp and sleeve are for Sterilight VH200 Series. This original Viqua/Sterilight UV kit which includes the QS-001 quartz sleeve, the S200RL-HO lamp. The UV lamp need to be replaced after 12 months of use. The quartz sleeve needs to be replaced when it can no longer be cleaned 100%. It is a great idea to have a spare lamp and sleeve on hand. Purchasing the sleeve and lamp in one kit saves you money. Please check out our video above on how to maintain this unit.