A Charlynn valve is what steers a full hydraulic system: you turn the wheel and the valve meters fluid to the ram. This one is listed by Howe as Load 2 turn x 8. The 8 lines up with Howe's 8-inch ram size, so it looks meant for an 8-inch ram, but ask us to confirm if you're unsure.
Pair it with a Howe full hydraulic ram and pump. Howe publishes hose diagrams for its rock crawler full hydraulic systems on its site.
Howe Performance part number 826.