The main line coming into my house is 7/8 inch copper, .99 OD. I can't find any 7/8 fittings other than a reducer to 3/4. Seems like a 1 inch fitting would be to big, whats on there now is tight fitting as you'd expect from any matching size pipe/fitting. The main shutoff valve needs to be replaced and I don't want to torque it as much as it would take to remove the current one. Currently it has a 7/8 to 1.25 FIP, 1.25 to 1 hex nipple, 1 inch regular port valve. Pretty sure the valve is the original 40 yr old.
Edit: Title updated