Ultraviolet UV Light Water Sterilizer Can be used individually or Connect to Other Water Filter System This is an inline filter system that can be used individually to sanitize your drinking water. The package includes all the parts you need to sanitize your water. It can also be used as a Add-on filter kit to upgrade our under sink 3 or 4 stage water filter systems or any under sink RO Systems. Note: UV light will consistently sterilize your water. But the input water quality may vary over the time. If this system is the only treatment for your drinking water, please test the output water regularly by professional water quality labs to make sure it is safe for drinking. Since there may be many different kind of risks in the untreated water supply, this system alone can’t guarantee the safeness of the water it produces if its input water is not from a tested drinkable water resource. UV light of this system stays on all the time for two reasons: 1. UV light bulb is like fluorescent light, frequent shut-off will greatly reduce its life span. 2. The UV light bulb takes a second to warn up from cold to reach its full sanitizing power. If it only turns on when the faucet is turned on, not fully sanitized water can be produced for the user. Package Includes: Stainless Steel UV Light chamber with 1/4″ OD quick connectors Quartz Sleeve and silicon sealerUV Lamp (6w)Sanitizing water up to 1.0 gpm water flow 110V Power AdapterInstallation manual One Replacement UV light: eBay item #324524109951 Two Replacement 6 watt UV lamps (224319960349) Replacement glass tube: eBay item #224372607189 Replacement UV Ballast Power Supply: eBay item #225386536588 Need more sanitizing power for larger water flow? Check our 16 watt UV system (1/2″ port, support up to 3 gpm): eBay item #323183729406 Payment Methods: PayPal (Preferred) Shipping: Usually 3 – 5 business day delivery including handling time. Thanks for looking!