13W GX23 DuraBulb Replacment Ultra Violet UVC bulbs for 13 Watt pond filters and clarifiers 13W GX23 UV PLS Tubes (This is the Double Lug version) - 17.4cm Length 253.7nm UV output for maximum sterilisation 12 Month Warranty - We recommend changing after 12 months to maintain maximum UV output Suitable for Fish Pond & Aquarium Filters
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