Features:The pattern changer is hand operated and has four inlet ports and four outlet ports. It provides 8-way, two position control of pilot signals. Operated by turning the handle 90 degrees to change the joystick pattern. Material: Carbon steel with trivalent plating. Function:PC Series pattern changer spool valve is designed to switch joystick functionality on equipment such as excavators. When operators move from one machine to another, they can set-up the joystick controls to function in a familiar format. Install:Quick and easy to install. Simple, reliable operations with no electronic components. Operating temperatures (With Nitrile seals): -40°F to223°F Temperature Range. Item: Hydraulic Pattern Changer Spool Valve. Compatiable with:This valve is fit for John Deere, Cateripillar, JCB or any excavator or backhoe with hydraulic pilot controls.