Pura ® UV Add-on 3 Ultraviolet UV water disinfecting lamp for 3/8" faucet feed line. The PURA UV "ADDON" Series is designed to be an easy addition to water treatment systems that require ultraviolet disinfection (RO systems, holding tanks, water dispensers, recirculating systems and more). This water sterilzer lamp is great to sterilize water in RO reverse osmosis, DI and ultra filtration systems. The "ADDON" 3 system has a 3 GPM flow rate. They are constructed using a 304 grade stainless steel body with a molded head that includes 3/8" quick connect fittings on the inlet/outlet. This versatile system includes a heavy duty mounting bracket, but will also fit standard 2" RO mounting clips. The UV "ADDON" Series can be used almost anywhere and is equipped with a unique power supply that makes installation simple, space requirements minimal and lamp changes easy. Features • Standard voltage 115V • 3/8" quick connect fittings. Uses Lamp #20 replacement bulb.