The Flint & Walling 133985 shell is a 6 sub shell made from high-grade stainless steel, measuring 21.69 inches in length. This shell is designed for use in various water systems, providing excellent corrosion resistance and durability. Its robust construction ensures long-lasting performance in demanding environments. The shell's dimensions are optimized for compatibility with standard fittings, making it an ideal choice for both new installations and replacements. This product meets industry standards for quality and reliability, ensuring peace of mind for users.