The Pentek 163508 is the correct replacement UV lamp for the following water filtration systems:
The Pentek 163508 UV Lamp for UV-110 Filtration System is a replacement UV lamp for the UV-110-1 and UV-110-2 water filtration systems, as well for the UV-110 and UV-110-2 model water filter systems from Ametek, American Plumber, Pura, and US Filter. Pentek recommends that this UV bulb be replaced approximately every 9-12 months. While the bulb will not normally burn out, its efficiency will decrease after a year of use. This UV filter lamp is a genuine Pentek part and is made from strong, durable material.
Pentek 163508 UV Lamp for UV-110 Filtration System specifications: