This strainer screen is for use with 1 582 cs socket weld. It is compatible with the following model numbers/series: 1 581 CS Screwed End, 1 582 CS Socket Weld. In addition, it meets the standards for ASSE, CSA, FM, NSF, UL, ULC, USC, and WQA. It measures 4⅝ inch length, with a spiral wound graphite filled seal.