Apologies in advance for not knowing exactly what these things are, but I am hoping the pictures attached can help. In the basement beneath the stairs I have what looks to be a main drain pipe as well as a vent, these go into something in the floor for wastewater to drain into. Again, sorry for the terrible explanation. Typically when something is draining, although not always, the drain pipe bangs and noticeably moves, which over time has caused some leakage around where it enters the floor. As I am sure you can imagine, the smell is pretty bad and can linger in the hallway. Not to mention any potential health hazards from the leakage. As far as I can tell it is no single thing causing the banging. I have heard it happen with the basement toilet, washing machine, also in the basement, but also heard it happen while upstairs and with what I assume nothing draining in the basement. I have read about using water hammer arrestors, but would I need to install one on anything that causes the banging? Initially, I would likely put one on the washing machine and basement toilet, then see if that stops all of the banging, if not try to track down what else causes it. So, going on the assumption that a hammer arrestor will stop the banging. my next thing is how do I correctly seal the pipe where it goes into the floor to stop any additional liquid / smells coming out. Thanks.

Hi, I was wondering if someone can help me. I need to have replaced a natural gas regulator valve for a BBQ gas grill. The regulator is a Maxitrol RV20L. In the picture attached, I have circled the fittings that I need help identifying. Secondly, is it possible to tell whether this is a 1/4" or 3/8" regulator by just looking at the picture? For certain reasons, I cannot remove the regulator at this time. Finally, is this a fairly easy job for a novice? I've connected natural gas stoves before, but is there anything special I need to know when replacing a regulator valve? Many Thanks!