I installed the pictured slip coupling on this vertical section of pipe. Apparently, I didn't get it quite right because it's leaking. I primed both sides of the pipe, the full inside of the the coupling, applied solvent to all those areas, then slipped the coupling down over the bottom pipe and back up, giving it a quarter turn. The pipes were touching each other within the coupling, and I got it centered over the two.
The leak is significant because the pipe has standing water in it above the effluent pump at all times, so my plan is to drill a hole at the repair site first, to let water drain out, then cut out the coupling for another go. If I could use an extra long slip coupling (or something) to avoid having to put an additional coupling in that vertical section, that'd be ideal, but I'm not sure if they make them long enough (or how much PVC needs to be inside both ends of a slip coupling for it to be "safe").
Any advice is very appreciated!