Made from S303 stainless material, the Proflow Vac-U-Pan E-Vac scavenger Hose Ends are dyno proven to pull up to 3” of vacuum from race engines. When placed downstream of the exhaust headers, this system improves horsepower and reduces crankcase pressure.Kit includes a 1 x mild steel & 1 x Stainless steel angled O2 weld-ons, Stainless steel -10AN male E-Vac fitting, 2 jam nuts for accurate orientation and 2 matching threaded blanking plugs . Both weld-on fittings is have M18 x 1.5 threads.