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Help with leak at union joining two lengths of pipe? (And what kind of union is this, anyway?)
I noticed some water on the floor of the crawl space under the 50+ (?) year old addition on the back of my 100+ (?) year old house. Took out the ceiling insulation and found this leaking union that splices together two pieces of pipe leading to a radiator in the back hallway. (see pics)
When I google "steam pipe union" I mostly find images of beefier unions with a big nut to tighten. But this seems quite thin and I'm not sure how it would even thread on/off since it doesn't appear to have flats for a wrench to grip.
Is this a DIY job to fix?
Many thanks in advance for any advice.