Pipe Repair Leak Clamp: Pipe repair clamp is made of high quality PE material. Precise fit for fast, leak-proof sealing. Comes with a washer and nut. Size Options: You need to determine the outside diameter of the pipe you want to repair the leak, not the inside diameter of the pipe. If the pipe has an outside diameter of 63 mm, then you can choose Dfnidy water pipe clamp repair kit. Make sure that the water pipe leak repair clamps are suitable for your water pipe size to avoid mismatch.