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-140109 is a replacement for VIQUA S810RL ultraviolet lamp used in the VIQUA S8Q-PA and SV8Q-PA systems and the discontinued SSM-37 system. Easy to install and maintain with replacement needed every 12 months. After 9,000 hours the UV light weakens and isn't strong enough to properly treat your water. Replacing your lamp annually with a genuine VIQUA lamp 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.