Pisces 5w PLS Replacement UV Bulb Lamp, designed for use in pond filters and UVC systems. It is a 5-watt UV-C PLS bulb with a G-23 base. It features two adjacent glass tubes and a 2-pin base. Made from high-quality clear glass, it is suitable for most pond filters and UV systems that utilize a 2-pin PLS style UV bulb. Regular replacement (typically every 6-12 months) is recommended to maintain optimal UVC effectiveness.
eBay