This is the brass power valve assembly that is threaded into the floor of the float bowl in Holley model 2210 and 2211 carburetors. These carbs are very difficult to distinguish visually. The best way is to open the carburetor and check the power valve design. The main difference between the 2210/2211 series and 2245 is the power valve. The other design of power valve is HVP8.
