My house, built in 1966, has all copper plumbing, including drain pipes. I have discovered a dripping drain pipe connection that takes the bath sink waste water away (in the wall, just downstream from the J trap).
If I use a torch to take this apart and resolder it, am I risking an explosion from the sewer gases in the drain pipe? I'm on a septic system, if that is pertinent.
Thanks in advance.