UPVC core: gray/national standard, widely used in industries such as chemical, electroplating, papermaking, construction, electronics, medicine, municipal engineering sewage treatment, agricultural irrigation, and civil water supply and drainage. It has strong acid and alkali resistance, smooth inner walls, and will not breed wall moss or water rust. Construction is simple, convenient, and fast. Used for converting pipe diameter and inner diameter, the names include: short joint, reducing joint, variable diameter core, etc. Complete specifications and sufficient inventory. Execution standard: GB/T 10002.1-2006 UPVC core specification