This is a Vacuum " T " hose / line connector from a 1958 Cadillac. This would fit all 1956, 1957, & 1958 Cadillac's. This came from under the dash of a 1958 Cadillac and the vacuum lines where attached to it. The horizontal hose barbs are a smaller size than the vertical one. This is in good used original condition. Sold As Is, As Shown.