The first of its kind, Skunk2s Black Anodized Billet VTEC Solenoid Housing is designed to be used with the F20C and F22C engines/ cylinder heads and is compatible with Hondas original pressure sensor, solenoid internals, and gasket. VTEC Solenoid Housings for Honda's F Series VTEC engines are manufactured from 6061 billet aluminum, anodized exclusively in Skunk2's Hard or Black finishes for good looks and corrosion resistance.