Chain Link Fence TOP RAIL SLEEVE: 1-5/8" ~ Chain link pipe connector to connect top rail pipe size 1 5/8 inch in diameter. Chain link top rail sleeve connector. Connects chain link fence rop rail size 1-5/8" length is 6" Galvanized Fence Hardware Also use to make a dog run (or kennel) if using 1-5/8" pipe on run.