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Lifegard Quartz Sleeve for 90 Watt Pro Max UV Sterilizer Part # R450204A --- Penn Plax Marlin Boyd Chemi-Pure Green is aLifegard Quartz Sleeve for 90 Watt Pro Max UV Sterilizer Part # R450204A This Replacement Quartz Sleeve is for the old style Lifegard Aquatics Pro MAX 3" 90W Standard High Output UV Sterilizer and the old style Lifegard Aquatics Pro MAX 5" 90W Standard High Output UV Sterilizer. Note The old style does NOT have the Internal Locking Assembly on the open, wired end of the UV. Specifications OD: 22. 5 mm ID: 20 mm Length: 605 mm Fits 3" or 5" Diameter