If we slide a 1/2 inside diameter pipe into a 3/4 inside diameter pipe how much watch pressure do we lose. Would that cause an issue when the house was sold and the buyer inspector noticed the weaker water pressure. They don't find everything because my inspector failed to find a gas leak as well as the fact that the roof had been in a fire years before. The water heater had propane fittings when the gas was natural gas and required natural gas fittings and the inspector missed that. Maybe they and the buyer think the water pressure through half inch pipe is normal.