I have an old house that needs some pipe replacing which I plan to do personally. However, before getting in to it I need to have a safe and trustable main shut off valve. The one i have now is old and sort of leaky. I could have the city shut off water at the curb to replace it but here is the problem, the main shut off valve is attached to a very old rusty pipe that disappears behind the wall in the basement and goes all the way to the curb. I am not a pro but I am afraid that if I unscrew the main valve away fomthe pipe I will be left with a highly corroded male thread on the pipe that cannot be reused. If that is the case, I should then have the pipe going to the curb also replaced. Ok so now is not a weekend project anymore.....

Does anyone know how expensive is to replace the lines from the curb to the house? we are talking about 50 feet and 1 foot deep.

I also think that brand new steel pipes in the ground from the curb will give the right pressure and hence no pressure drop in the house....