This document describes how part numbers are used to identify items in Legris pneumatic equipment. Part numbers for fittings and valves contain codes that indicate the item type, nominal diameter, thread type, and model series. Part numbers for tubing and hose contain codes for the item type, nominal diameter, color, and inner diameter. Color codes are indicated by two-digit numbers corresponding to specific colors. The coding system is designed to make it easy to identify product specifications from the part number.