Length of coiled tubing A paint circulation system for supplying a paint mixture to a paint booth in an automobile manufacturing operation, the paint circulation system comprising a number of paint drop lines, the number of paint drop lines including a first paint drop line and a second drop line, the first paint drop line including a first color change valve for connecting a first paint spray gun assembly thereto, the first each paint spray gun assembly being operative to spray a paint mixture received from the first paint drop line at a first operative flow rate, the first paint drop line being positioned downstream of a first paint supply node and upstream of a first paint return node, the first paint drop line further comprising a means for generating a first differential pressure...