The first of its kind, Skunk2’s Hard Anodized Billet VTEC Solenoid Housing is designed to be used with the 2.0L H22A and F20B engines/ cylinder heads and is compatible with Honda’s original pressure sensor, solenoid internals, and gasket. VTEC Solenoid Housings for Honda's H Series VTEC engines are manufactured from 6061 billet aluminum, anodized exclusively in Skunk2's Hard or Black finishes for good looks and corrosion resistance.