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Does an AAV have to sit directly in vertical line with a drain going through floor or can the vent be routed a bit to the side? Current through floor drain is off-center below sink and if I place an AAV directly over the the drain, I can't really go up much before hitting the bottom of the sink...

Hello all! Kitchen sink is draining poorly. Flippers bypassed old sink vent. Can you advise on whether and also how: 1) Should I just put in an AAV coming off of the end of the P trap as in picture below (what adaptor would work here? Some sort of a T?) OR 2) Tie the existing drain into the...

Lots of mentions about using a “drop of oil” with compression fittings. What specifically is meant by that? Can I use some faucet grease for the same purpose? And on a related note, is faucet grease the best thing to use for lubrication various rubber parts like o rings, etc.?

I was shopping for some compression fitting supply line valves and noticed the overwhelming majority of supply line valves are of the “push to connect” flavor…presumably catering to DIYers at the big orange. I’m just curious, is that the same thing basically as a sharkbite with the back facing...

My original bathroom sink drain is not centered and the new vanity would need quite a bit of mods to make it work So I want to just move the drain. Can someone confirm what I have in the picture will work? I would remove the original drain tee, put in a new one but rotated left, run a short...

Replacing small old clay sump pit with a new, larger one. Perimeter drain channels connect to existing pit via clay pipe under the slab. Once I break up the old pit to enlarge the hole, how do I tie in the existing clay pipe to the new pit? I also worry that, when breaking things up, I may not...

So this weird thing has happened for the third time in last few months. The sump pump works fine and then one day I’ll go to the basement and it’s flooding and the pump isn’t working. I tiptoe my way to the sump pump, gently lift the pit cover and the pump magically kicks on. I really don’t...

It will pump the water out, and then run dry. Is this usually the float switch being stuck? It's a Liberty Pumps model 403. I'll be taking it apart later today. PS - if I do end up having to replace it, can I just put a regular sump pump that will fit into the existing enclosure, or is the...

I'm starting to tile, and ideally would like to have anything sticking out from the drop elbows nicely sealed to the tile backer board before I tile. Problem is I'm not sure what length I'll ultimately need and not sure I'm reading these instructions from Grohe correct. The holes are for 1 -...

Installing 1/2" wedi over studs. After everything is fastened and sealed, when I give the panels a good push with my palm in the center between two studs (16" on center), I feel and see a bit of flex in the panel. Nothing crazy, but it's there. Is this something to worry about for the final...

My PVC drain shoe sits about 1/8” out of level with respect to the bottom of a new cast iron tub drain opening. Consequently, in order for the rubber gasket to properly seal all the way around, I have to over tighten the flange which results in a slight bulging of the gasket on one side while...

Within a year of installation, it seems if you just look at one of these valves wrong, they start to drip. Even ones that are full brass. Why is that? Is there a better alternative/brand? Same with the braided hoses - even if I hand tighten them plus just a quarter turn pipe wrench, they are...

My bathroom sink drain stubout tee has a “depth limiting lip/ring” (see picture) about half an inch into the tee. The lip doesn’t go all the way around inside the tee, but a good 3/4 of it has it. Question: is this just an old manufacturing defect? or is it there on purpose so that when making...

Whenever my laundry pump drains, there’s gurgling from the downstairs shower p trap. There is no gurgling from the kitchen p trap. There is already a vent as seen in the picture and I can see the spring mechanism activating when the laundry pump is draining. The laundry pump itself has an open...

Can you please double check my bath/shower plumbing and/or give advice on things to check before closing up. All drop elbows are nice and plumb and secure. Obviously the most important - I don’t have the water hooked up right now, will do tomorrow for full test. Two uponor 3/4 to 1/2 MNPT...

vs I’m trying to eliminate an extra elbow. Any reason I shouldn’t mount a drop elbow in an orientation that helps me do that. See pics. Thanks

The spout I have requires only about 3/4 inch of threads sticking out from finished wall. And it doesn't have much wiggle room, maybe one full turn of the threads. IF I leave a sweated copper stub out, I foresee a difficulty being able to then sweat on a threaded adapter because it will be so...

I’ve seen some shower/tub plumbing where the tub faucet line is routed in a U (sort like a p trap) from the valve to the tub stub out. Why is this done that way in some cases?

Does anyone have experience installing the Grohe Rapido Smartbox rough-in valve? I see that the outlets (A, B, C in the picture) are at 3, 9, and 12 o'clock - so what would be the best way to route the tub spout outlet if this is installed on center, short of a bunch of elbows. Seems like a...

My finished manifold system. Got to say I’m quite proud of how it turned out, even though I am sure there’s dozens of things “not to code” y’all professionals will want to scream out loud at Also wanted to thank all the pros for all of the advice on this forum! What do y’all think?