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This is the washer that secures the screw that is used on the base of the Hayward Stainless Steel Micro-Clear and S-220/240 Filters
Pro and VL Series Sand filters models C5501575XES
Fits hayward h-series millivolt electronic ED1 style pool heater models H2001
Also fits Pentair Quad pool and spa D
Jandy Zodiac W28000 Duoclear & Fusion 25 Replacement Mineral Cartridge This is the washer thatUsing DuoClear' means you can significantly reduce levels of chemicals like chlorine in your pool. That means a reduced potential for red eyes, skin irritation and unpleasant odors. DuoClear works automatically. So you can spend more time enjoying your pool and its fresh crystal clear water. All you have to do is replace the DuoClear cartridge every six months. DuoClear even has a signal light that reminds you when to do that. Zodiac's Duoclear system
