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INTERNAL PIPE SUPPORT: Designed to fit inside 22 mm plastic plumbing pipe, helping support the pipe wall and maintain its round shape. PUSH-FIT APPLICATION: Designed to be placed inside the pipe end before connection to a compatible 22 mm push-fit fitting. FLANGED PROFILE: The raised end helps position the insert at the pipe opening and prevents it from passing fully inside the pipe. SIZE GUIDE: The 22 mm measurement refers to the compatible pipe's outside diameter, not the bore or insertion-barrel diameter. COMPATIBILITY CHECK: Select the insert according to the 22 mm pipe size and fitting system, and check the manufacturer's guidance before installation.