LMI uses Liquid End (LE) numbers and letters to describe the type of construction and the materials that come into contact with the chemical being pumped. What started as a relatively simple system got more complicated over the course of time. There have been three distinct generations of Liquid Ends, along with custom versions, even though many of the original numbers and letters are still used. Pick the number range of the LE you are looking for, and that will take you to a table with the specific Liquid End you are looking to find.