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GlowShift's 1/8-27 NPT Male to Male Restrictive Barbed Fitting Adapter is the fitting you need when installing a Boost/Vacuum Gauge to your car, but cannot tap into your vehicle's line with a T-fitting. This brass fitting features a 1/8-27 NPT male thread that installs to a drilled/tapped intake manifold and allows you to gain boost readings directly from the source. Simply insert the hose that came included with your turbo boost gauge to the barbed fitting and run the other end of the hose to the back of the gauge. GlowShift includes free lifetime technical support and a one year limited warranty.