Metal Expansion Joints are generally used to absorb movement in piping caused by thermal changes. Standard bellows are alloy 316 stainless steel. We also stock alloys 304 and 321, with other special alloys available. Control rods, liners and covers are available, as required. End fittings include welding nipples, fixed flanges or floating flanges. Standard pipe sizes range from 2" through 84". A variety of size, length and end fitting configurations are available. Units designed for many special applications and are built to customer specifications.