4000 Series D.E. filter * Maximum operating pressure 50 PSI; 2-inch plumbing connections provide maximum flow * Corrosion-resistant 20-inch diameter fiberglass filter tank for strength and durability * Unique spiro-mite grid design provides high efficiency filtration and longer filter cycles * Exclusive clamp ring design is proven to be safe, strong and reliable. It allows for quick and easy access to internal components; measures 22-inch length by 39-inch height by 22-inch width