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Thank you for all the input and advice. Just in case someone out there ends up with the same issue, here's how I fixed it. I tried to unscrew the entire sillcock (it's 12" long and goes into a finished area of basement behind a wall) but it wouldn't budge. So I found the same exact one online...

Thank you for guidance, will do. I'm just hoping that when I go to unscrew the spigot, it's not soldered on and I end up ripping apart the copper and having to tear into the finished basement wall!

Yes, exactly. When the outside spigot is on, it's like a slow machine gun sound, even if nobody is touching the faucet. If I turn it all the way off, the banging is gone. If I turn it all the way on, the banging is gone. If I fiddle with the ball valve to adjust the flow rate, I can usually make...

Have a few outdoor spigots on newly purchased house. One of them has an inline ball valve shut-off about halfway across the basement toward the outdoor spigot. When my kids play with the outdoor hose/sprinkler, and they put the water on any setting other than off or entirely on, it makes a...

Wanted to update readers with a picture and follow-up. Just in case anyone runs into a similar issue and is looking for guidance. Turns out it's a total PITA to put an air admittance valve between the p-trap and wall, but I managed to make it work. The real challenge was converting all the...

Here's a picture. I think I can make that work. How high up does it have to go above p trap? Higher than the sink's drain? I can probably get it up around 1" above level of sink drain, about 5" above the trap arm. Is that high enough?

I don't think there's enough room to put an AAV after the p-trap and before the wall. Should I put them in the wall immediately before the main horizontal drain pipe? I'll take a picture...

Thanks for replying! Do you think the solution indicated in red on the diagram would work to vent the sinks? Or will I need to tap into the cast iron vent in the attic?

I installed two pedestal sinks side-by-side in a bathroom, replacing a single bowl vanity. I plumbed it using 1.5" p-traps in a pretty typical way. Each sink's p-trap leads to a single 2" pipe running horizontal for about 3-6 feet (6' run for farther sink, 3' run for closer sink) to a vent that...