1. The problem statement, all variables and given/known data Need to find the pressure difference between the two water pipes. Specific gravity of water = 1000 kg/m^3, specific gravity of oil = 800 kg/m^3 2. Relevant equations pressure = height * specific gravity * gravitational acceleration 3. The attempt at a solution I think that is incorrect because the pressure at two points would be the same. If that is the case there would be no pressure difference at all throughout the entire manometer? This is the first time that I have seen a question in which the manometer doubles back on itself.