Puras nifty AddOn 3 is a three gallon per minute system each designed as a stand alone UV unit or as a convenient addition to an existing drinking water unitThese are compact easily installed systems that are trouble free and easy to service They have no filters to change and require only an annual lamp changeThe Add On units are fitted with John Guest type 38 push in quick connect fittings Simply push your 38 plastic or polypropylene tubing into the fitting for a tight leak free seal ModelPura Add on 3 UV003Suggested UsePost purifier for larger reverse osmosis or otherdrinking water system Dental offices Small water vending systemsMax Flow Rate3 Gallon per minute GPMReplacement Lamp Size 20Lamp Power Usage22 WattsReplacement sleeve 20Voltage115Height225Cap Diameter35Tube Connection38 Quick Connect Additional Details ------------------------------ Product description: Puras nifty AddOn 3 is a three gallon per minute system each designed as a stand alone UV unit or as a convenient addition to an existing drinking water unitThese are compact easily installed systems that are trouble free and easy to service They have no filters to change and require only an annual lamp changeThe Add On units are fitted with John Guest type 38 push in quick connect fittings Simply push your 38 plastic or polypropylene tubing into the fitting for a tight leak free seal ModelPura Add on 3 UV003Suggested UsePost purifier for larger reverse osmosis or otherdrinking water system Dental offices Small water vending systemsMax Flow Rate3 Gallon per minute GPMReplacement Lamp Size 20Lamp Power Usage22 WattsReplacement sleeve 20Voltage115Height225Cap Diameter35Tube Connection38 Quick Connect