About the 13w Single-Ended UVC Bulb - BOGOF Manufacturer: UVC Bulbs ADD ONE 13W BULB TO YOUR BASKET AND RECEIVE TWO!!! This popular single-ended UVC bulb fits the following filtration systems: All-in-OnesFish Mate 5000 Bio Filter & PondXpert TripleAction 3000 (5m cable)Hozelock EasyClear 9000PondXpert TripleAction 3000 Classic (5m cable)PondXpert TripleAction 3000 Classic (10m cable)PondXpert TripleAction 9000 EvolvePondXpert TripleAction 15,000 EvolveVelda Floating Combi 2500 FiltersHozelock Bioforce 12000 (mid-2012 serial numbers 16 10 01 or higher)PondXpert SpinClean 6000 (Newer Model)PondXpert SpinClean 8000PondXpert SpinClean 12000PondXpert SpinClean Auto 6000PondXpert SpinClean Auto 8000PondXpert SpinClean Auto 12000