We're in a really old house. So, the rigging on the install of an A/C unit had a bucket for condensation. I wasn't too thrilled to dump six times a day. I ran a 3/8in tube from the unit to the bathtub through the wall in between the closet and bathroom easily. But, it's silly to go into the tub since it passes right behind the sink and its drain. Are there any suggestions on how to easily tap into the sink drain, insert or affix the tube, and seal it off? Plumbing is a realm I'm not too familiar with. I considered drilling a hole, pushing the tube through so that it goes through the trap and directly into the drain. Alternatively, I could just have the tube barely inside going down toward the trap and seal it up with some glue. My wife thinks that guests won't enjoy the idea of bath water mixing with A/C condensation... Any thoughts would be appreciated.