I just picked up a couple of old cast iron radiators from a neighbor's "remuddling" project, and I'm trying to figure out how to use the standard connectors that they're plumbed with. In the past, I've simply removed these old brass fittings and installed standard black iron or copper fittings into the standard-thread bushings already in the rad, but since these are in good shape and it would be a lot less work just screwing a fitting into what's already there, I'd like to give that a try. However, they don't accommodate a standard 3/4-inch fitting. The threads are somewhere between 3/4" and 1". I read somewhere (I think) that I what I need are "angle unions" which, judging by most of the other radiators in my house, are a kind of special street 90. No clue where to score such a piece. Any thoughts? I plan to put 3/4-inch ball valves on these rads instead of conventional radiator-specific gate valves, so I need to reduce the line to a standard 3/4-inch pipe thread at some point. I can post pics, but won't unless somebody needs to see precisely what I'm talking about. These rads would replace HW baseboards in my mom's farmhouse, BTW, which I find to be pretty worthless and ugly, to boot. Nothing like a solid mass of cast iron and hot water on a cold winter morning to warm body and soul, IMO.