The MegaFlow SpeedKit-V makes it easy to hook-up multiple simultaneous connections. The kit contains (1) 3/8in FL and (1) 1/2in FL Speed-Y. Both Speed-Y's have (2) 3/8in MFL fittings and are Vacuum-Rated to 20 microns. Between both Speed-Y's, the SpeedKit-V will work on most Vacuum Pumps. The MegaFlow Speed-Y is Vacuum-Rated to 20 microns and designed for high pressure refrigerants, such as R410a. The MegaFlow Valve Core Removal Tools work with both Standard 1/4in Systems and Ductless 5/16in Systems. Always remove valve cores from the system for Full Flow and Fast Evacuation. The MegaFlow SpeedKit-V features (2) 1/2in 6ft MegaFlow Vacuum-Rated Evacuation Hoses. The Vacuum-Rated hoses won't permeate or collapse in a deep vacuum. With a large interior diameter these MegaFlow hoses have greater flow than standard 3/8in hoses.