Looking for a value driven, alternative solution to your name brand "factory" replacement lamp? US Water Filters replacement lamps are made to the exact same stringent manufacturing protocols, and are backed by a one-year, no-hassle warranty. The USWF-140140 is a replacement for VIQUA S212RL used in the VIQUA SQ-PA, SQ-PA/2, SC1, SC1/2, and VT1 water systems. Easy to install and maintain with replacement needed every 12 months. After a 9,000 hours the UV light weakens and isn't strong enough to properly treat your water. Replacing your lamp annually ensures optimal system performance. Safety Note: NEVER look directly at the UV lamp when it is powered on. Follow the instructions carefully to avoid injury to eyes and skin. Includes 2 replacement o-rings.