Hey guys, I Finally got around to installing a sink in my detached shop. The water line was already ran by the previous owner and exits through the basement wall via black poly pipe. I turned the water on and checked for leaks, I noticed a VERY VERY slow leak at the threads of where the plastic barb fitting threads into the metal elbow. And when I say slow, I mean it doesn’t drip just accumulated in the thread. See pic below to see the area where the leak is. This has likely been installed and leaking like this for many many years unnoticed. What would you guys recommend I do? I’d prefer not to disturb the barb side since it is not leaking, and worry if I do I will create another leak lol. Kind of tight quarters as well. Can I possible just tighten the plastic fitting a little bit? Is there any sort of silicone sealants I can apply at the face of the metal elbow?Let me know your thoughts.