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PermaGuard Solid Vinyl Rectangular Safety Pool Cover 20 x 40 Feet, 4 x 8 Left 4-Foot Offset No Drain material_Cast Iron This is a PVC ReducingThis Meyco pool safety cover is designed to fit a Rectangular 20 x 40 Foot Pool with 4 x 8 Left 4 FT Offset. The actual cover will arrive larger to give you enough overlap around the entire pool for proper installation and use. Meyco's PermaGuard Solid Safety Covers feature an ultra strong and ultra light vinyl material; almost 1 3 lighter than other vinyl materials. The PermaGuard material is designed to form a more effective barrier to prevent