If your ATS ultraviolet system needs a new bulb, this LSE Lighting UV replacement lamp is exactly what you're looking for! This 18-inch (450mm) UV bulb features a standard 4-pin base and delivers powerful 254nm UV-C output that keeps your system running effectively. It's designed to be fully compatible with ATS GDS-8 systems and also works with DWS-8V, EV-8E, SE-8V, SL-5, SL-8, and SL-8V models (just to be clear - this is a compatible replacement, not made or endorsed by ATS). The installation is straightforward - the standard 4-pin base ensures a secure, proper fit in your compatible ultraviolet system. LSE Lighting manufactures these in an EPA registered facility, and they're engineered in the USA for reliable performance and durability. The consistent 254nm output ensures your air or water purification system operates at peak efficiency. Important safety note though - ultraviolet UVC light can be dangerous to eyes and skin, so always use appropriate safety equipment during installation and servicing. This professional-quality replacement bulb gives you the performance you need without paying premium prices for OEM parts. Whether you're a homeowner maintaining your system or a professional servicing multiple units, this LSE Lighting UV lamp delivers the reliability and effectiveness you expect from a quality ultraviolet bulb. Just remember to handle with care and proper safety precautions during installation!