MegaFlow 1/2in High-Speed Evacuation Hose Achieve the true potential of your vacuum pump with the MegaFlow 1/2in evacuation hose. Features and Benefits Vacuum-Rated to 20 microns Larger 1/2in Internal Diameter for superior performance Ultra-flexible for easy connections in tight spaces Won't permeate or collapse in a vacuum Full Flow - 16x more flow than a restrictive 1/4in charging hose 1/4in FL and 3/8in FL fittings make it easy to connect to the Appion Speed-Y, Appion Valve Core Removal Tools and most vacuum pumps 3200 psi burst and 640 psi working pressure Larger Hoses for System Evacuation Even when restricted by 1/4" system ports, using a 1/2" hose greatly reduces resistance and increases potential flow. This is especially true during system evacuation. Just using one 1/2" hose with 1/4" fittings can result in one tenth the evacuation time compared to one 1/4" hose.