These AEM 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. AEM Electronics boost control solenoid kits include -4 AN fittings so that you can securely attach wastegate lines without worrying about leaking at the connection. AEM also includes the barb-style hose fittings where push-on fittings are required.