Distribution block and adjustable proportioning valve built into one. This combo valve allows you to plump your lines cleanly while being able to adjust the pressure to your rear brake lines. Another cool feature of this automotive distribution block is the built in brake light switch. This brake light switch allows you to activate your tail lights with hydraulic pressure from your brake system. Adjustment Style: Adjustable, Inlet Quantity: 2, Inlet Attachment: 3/8-24, Outlet Quantity: 3, Outlet Attachment: 3/8-24, Proportioning Valve Finish: Black, Proportioning Valve Material: Aluminum, Quantity: Each.