Many of the LMI, Roytronic and Unidose Liquid Ends are listed and included in this section of the webpage.

Here’s how to find the diagram and parts list for your pump’s liquid end (LE):

Example:  The LE part number is found within the pump’s model number:  i.e., the liquid end for pump model number A141-358SI is LE-358SI.  Please give us a call if you need help in determining your pump’s liquid end or if your liquid end is not listed here.

  • 20 to 297 LE‘s are the oldest LE style and in most cases use a ball and seal check valve style.  They use black coupling nuts with stainless steel clamp rings (3/8″ or 1/2″ tubing) or black ferrules (1/4″ tubing) in their tubing connections.
  • 312 to 498 Legacy or Liquipro LE‘s are the next generation of LE’s.  They use a cartridge style check valve.  They use black coupling nuts with stainless steel clamp rings (3/8″ or 1/2″ tubing) or black ferrules (1/4″ tubing) in their tubing connections.  Multi-function valves are smaller than the newer Roytronic LE’s.
  • Roytronic LE‘s are the newest generation of LE’s and also use a cartridge style check valve.  They use a different style of tubing connection system that consists of a black coupling nut and yellow male and female ferrules for the 3/8″ or 1/2″ tubing, and a black coupling nut and single yellow ferrule for the 1/4″ tubing.  Multi-function valves are larger with rounded edges looking somewhat like a football in shape.
  • 541 to 637 LE‘s are used with the larger G Series and Motor Driven pump liquid ends.liquid end types

Liquid Ends 312 to 498 (Legacy)

Liquid Ends 541 to 987

Liquid Ends Roytronic