Proflow Solenoid MAC Valve Boost Controller Replacement 3-Port Each PFEBC300 These Genuine Mac Electronics boost control solenoid kits will not degrade rich fuel mixtures like most common boost control solenoids. This will significantly extend life and eliminate the chance of sticking from contamination. They are pressure-tested to an amazing 100 psi and will not leak. Kit includes the barb-style hose Hose Ends where push-on Hose Ends are required.