In fairness to all, we don't discuss pricing on the Wall. Thanks for your cooperation.
Want to add a ball valve as a king valve on my main 2inch line after my header but a full port 2 inch ball valve opening is almost a half inch smaller than the 2 inch pipe opening. Is this ok or should I bush it up to2 1/2 and then back down to 2 inch.
My other question is where should the main vent be. I have a parallel flow gravity one pipe system with a dry return. The vent is presently at the end of the dry return before going into the wet return back to the boiler. There is no main vent on the end of the main but there is pipe about a foot before the very end of the main not going to a radiator that is capped. Maybe someone removed a vent from that location? Should there be a vent there also?