ZYN3641 Features: * Depressor proportioning valve * Two depressors work best for four-wheel anti-lock systems * Proportioning valve depressor works on various GM utility vehicles, vans, and pickups fitted with Kelsey Hayes anti-lock brake systems * Also works on rear-wheel anti-lock brakes Dimensions: * Dimensions: 1.2"" H x 4.6"" W x 6.7"" D