If you want to build extra hydraulic circuit on your tractor, this 2-circuit hydraulic control block could be a good choice for you!

One of the circuit also has a float function, which means that the given section allows the hydraulic oil to flow freely in a certain position of the lever. In this case, the pressure in the working cylinder of the connected tool is removed in both directions, so it can be moved freely. In this way, ground tracking is ensured, e.g. using a snowplow. If this function is not used, the lever will return to it's initial position, like the circuit without float function.