Hi, i have two large old cast iron radiators that i'm fixing up. I took them apart pretty easily and have all the sections separated. When they were hooked up, a lot of water was leaking between the lower end of the sections. After separating them, i discovered that the push nipples that connect the sections are rotted and broken. Where can get push nipples at a decent price? I need 18 per radiator, and the only place online that I can find them is oswald supply for 15 a piece. This would be crazy expensive for both radiators. Any help would be appreciated, thanks.

I currently have a small amount of carbon monoxide backdraft from my boiler/hot water heater. It is not enough to set the detectors off except occasionally. The water heater has melted caps on the top from the backdraft. I plan to hire a plumber to direct vent a power vent water heater. This should eliminate the water heater problem but will it create a new problem since the boiler will now be venting on it's own though the chimney flue? My understanding is that you cannot direct vent a boiler and leave the water heater orphaned to vent though the flue alone because it will not hear enough to create sufficient draft but if I orphan the boiler by direct venting the water heater will that also not create siffsuffic draft?