4-port solenoid for use where a wide range of boost pressure is desired (5-40 psi for instance). Can be used with low spring pressure to achieve high boost pressure. Available in 3 Port & 4 Port Configuration Features 1/8 NPT Female Ports Anti-Vibration Mount Flying Lead (2 Wire) loom – Unterminated Nickel Plated Hose End Fittings (Suit 6mm / 1/4″) ID Hose