LSE Lighting UV Bulb 5W for AquaTop PF15-UV SP5-UV PSE1 Filter Wattage: 5W Base Type: Square Base - 2pin Length Overall: 4" This UV Bulb by LSE Lighting is 100% compatible for AquaTop models PF15-UV Hang-On Power Filter, SP5-UV Submersible UV Sterilizer, PSE1 Power Filter Protein Skimmer 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.