These UV bulbs will fit all major manufacturers. If you are using these UV bulbs for sterilisation purposes they should be replaced every 6 months ( approx 4000 hours) bulbs used for clarification of ponds can be replaced every 12 months ( approx 8000 hours).
Replacment Ultra Violet UVC bulb for filters and clarifiers
Fits all major manufacturers
Replace every 6 to 12 months
Sterilises water in Aquariums and Fish Ponds
When changing UV lamp we recommend that the Quartz Sleeve is cleaned at the same time