I dont know what this is. Whether it is a blower or a Vacuum pump. it is a vane style machine with 4 plastic vanes. There are no valves in the suction or outlet side. If i run it with an electric drill it does crate some pressure in the clockwise direction and it does create some vacuum in the anticlockwise direction. The body is cast iron and  so is heavy 3.5KG Dont want to chuck it out.