AquaTop Replacement 7W UV Bulb Square Base 2 Pin AquaTop PF40-UV Hang-On Power Filter w/ 7W UV AquaTop PF25-UV Hang-On Power Filter w/ 7W UV AquaTop SP7-UV Submersible UV Sterilizer, 7W AquaTop UVE7 Submersible 7 Watt UV Sterilizer