1985 Isuzu i Mark 1.5L 4 Cyl. 1989 Isuzu i Mark 1.5L 4 Cyl. 1986 Isuzu i Mark. 1989 Isuzu i Mark 1.6L 4 Cyl. 1987-1988 Isuzu i Mark. Notes: OE Type. Atmospheric type valve allows cooling system to pressurize as needed, resulting in less strain on system's components.
