Sanitary rectangular manhole is a special hygienic access opening with a standard rectangular structure, widely applied for large-opening inspection and maintenance of sanitary tank equipment. Different from round and elliptical manholes, the rectangular design provides a larger operating space, making internal cleaning, overhaul, material feeding and equipment maintenance more convenient and efficient. Manufactured from high-quality SS304/SS316L stainless steel with high-precision seamless polishing, the manhole features a smooth surface without sanitary dead corners, fully adapting to CIP automatic cleaning and high-temperature sterilization. With reliable sealing and stable structural performance, it meets the strict hygienic requirements of food, pharmaceutical, biological and fine chemical industries, and is an essential accessory for various sanitary production vessels.