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I'm installing a cast iron air scoop on my boiler system, but the piping is copper. Do I need a dielectric union between the two? If so, can black iron be used between the union and the scoop?...

That's the kind of opinion I was looking for...thanks

I need to replace an expansion tank and was looking at an amtrol fill-trol model. A boiler guy instead recommended using a regular diaphram tank with a separate auto-fill pressure reducing value. I...