These Welch 1402 major primary kits include all the components of the gasket kit plus v-belts, exhaust valves, springs, and Phenolic vanes for a major rebuilt or overhaul. Primary Kits include all the components of the secondary kits plus Phenolic vanes for a major overhaul. The shaft seal assembly in these kits are made from lip-type seals. These Welch 1402 repair kits are guaranteed to meet or exceed OEM specifications.