AQUATOP 10 Watt UV replacement bulb compatible with the following AQUATOP products:

UV-10 Submersible UV Lamp

In-Line UV Sterilizer 10W - IL10UV

Aquatop OEM Replacement Parts Policy 

"Aquatop parts are designed and intended as original equipment replacement only for Aquatop branded products. Use in brands other than Aquatop can result in poor performance, leaks, and failure and Aquatop offers no warranty for any problem arising from the use of Aquatop replacement parts in another brand of product."