The #1 DWV Plumbing Mistake (and how to prevent it).

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This guy is doing the Lord’s work, I tell ya... what an incredible resource.

Thanks for posting this - best I've seen so far. I'm not a plumber, but I like to know what's going on so I can make sure work is done right when plumbers do it, and for easier tasks, when I do it.

Awesome! Laymans description of what to use. This will be quite helpful when I get to the plumbing portion of my house build.

Wow! This is among the best-produced and thorough youtube videos I've ever watched. I'm preparing (watching lots of videos and reading plumbing books!) to replace my entire DWV stack and the bathroom fittings in my 1920 house. As soon as I can scrape together $50 for your ebook, I will definitely buy it. Again, great video.

Thanks. I was getting ready to convert a single sink drain into a double and I think you just saved me a headache.

As a master plumber in Colorado and Washington I stand by this video. Thank you for giving folks this info.

Former Montana state plumbing inspector, it would be nice to see more videos like this. So many homeowners wanting to do their own work get it wrong and wind up spending three to four times the cost. And when in doubt, call your local inspector. They are more than happy to come out and look and it WON'T COST A DIME! Better to be safe than have a real mess in the end.

I have been doing plumbing for 56 years, with the last 38 of those years working for myself in Australia as a licensed plumber, roof plumber, drainer, gas fitter and LPG installer I have seen many changes in the industry, some not good but most were. As an apprentice, I spent 5 years studying, 3 years to become a journeyman and 2 years of advanced plumbing to become licensed. I began with earthenware drainage pipes joined with cement, copper for hot and cold water, with copper wastes into cast iron stacks in multistory buildings. Also galvanised steel pipes for gas lines. Today, almost everything is in plastic. The worst is that a plumber today is more interested in the money than the job. Most of them think of a plumbing license as a license to print money. Even though as I am approaching 72, I still work part time as a licensed plumber. I like it too much to give up completely. There is some differences with what we call the fittings. For example; a sanitary 'T', we call an 88° square junction. We don't have "a combo wye and 1/8 bend", we just add a 45° bend to a 45° junction. We never use fractions to describe any fitting, only ever the degrees that it is, that reduces confusion. Our sanitary bend fittings come in 5, 15, 30, 45, 60 and 88 degrees.

The National Standard Plumbing Code used in New Jersey allows short pattern fittings to be used in horizontal to horizontal changes in direction. But only for individual fixtures.

This is the first video of yours I've seen, fantastic information and providing things free is above and beyond, sir. Thank you and Godspeed Mr. Spitz!

Great video. You showed us handymen important complex information in an easy to understand way. Thank you for sharing your knowledge!

recently corrected plenty of these mistakes in a house a bought and currently doing a full house remodel. as well as added more venting. Before they decided that the waist pipe going from upstairs to down stairs needed more venting so they just drilled 3/4 inch holes on top of the pipe... you cant make that shit up. they tried to make the upstairs sink and shower drain uphill into the main which of course doesnt work. They used Ts instead of wyes or combos, used short radius 90s instead of long radius, ran to small diameter piping in places and went from 1 1/5 down to 1 1/4 from a banch to the main. found several joints incorrectly mated. decided glue was all it needed. lacked true supporting of piping which had sagged over time. a lot of which wasnt noticed until you removed the 3 foot of insulation off of it, or pulled the drywall to see it. Or well lack of drywall and more paneling. Even the domestic water was a mess, PVC main, switch to cpvc to copper back to cpvc, back to copper. ripped it all out except the main, added a true main shut off inside the house back at the point it comes out of the ground. I know some will boo and hiss, but i went with pex as a replacement. In union commercial construction anyway. Most of the guys were telling me why not copper, pex isnt real plumbing. I said The price. Im doing it out of pocket, copper is nice and i dont mind it when im not paying for it. but I couldnt justify using copper in my house do to the price. so I went with pex and used the copper crimp rings vs the stainless pinch ring. No shark bites, ive seen those fail to offend. I have used the caps for temporary while testing or getting some plumbing working to at least have running water. I was going to use a pex manifold but for this house i couldnt justify the cost of one. but none the less i did install isolation between upstairs and down stairs as well as a shut off before and after the water softener and water heater. Might be over kill but if something happens i want to have control quickly.

Thank you very much for the information, just moved to a house with this problem, toilet so closeto a T that waste backs up!!! now I now how to solve the problem

I immediately subscribed to your channel because of the informative code and extra details in your video, Thank you so much for your time and efforts sir, God Bless.

Hey thanks for taking the time to do this. Awesome information!

Can you make more videos please? I'm an apprentice plumber and your videos are the best I can find.

Thank you for this easy to follow advice !!

Heck with 90's use all wye and 1/8 bends with a fitting clean out on back when there's room in your own home the future accessibility is great

I swear our computers are listening in on us, only last night my neighbours emptying of her bath tub resulted in much gargling in my bath waste. Her dad is a plumber! and ever since he made an alteration in her bathroom my bath drain is noisier, To cut along story short, it woke me up, the computer must have heard my rantings and low and behold just the following day the 'potential' answer, come source of my troubles is most likely in this video. Thank you for posting, so nice to hear from people with a really  professional outlook and conduct. I do a bit of plumbing myself sometimes so I am without doubt taking on board what you have said.