This fits your. Make sure this fits by entering your model number. Wattage: 9W Base Type: Square Base - 2pin Super Life of 12,000hrs This UV Bulb by LSE Lighting brand is 100% compatible with AquaTop models: UVE9 Submersible 9 Watt UV Sterilizer, CF400 Canister Filter UV Sterilizer, CF500 Canister Filter UV Sterilizer, UVCP-9 Submersible UV Sterilizer All lamps listed are compatible brand UV products. We do not sell AquaTop brand lamps. All AquaTop brand names, trademarks and logos are property of AquaTop.