How to Unclog Any Drain | Ask This Old House

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Published 2022-03-28
In this video, This Old House plumbing and heating expert Richard Trethewey shows us every common household drain, and how to unclog them like a pro.

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Plumbing and heating expert Richard Trethewey teaches host Kevin O’Connor everything he needs to know about plumbing clogs. From toilets and sinks to showers and drain lines, Richard shows Kevin what each system looks like inside and where clogs most often occur.

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Where to find it?
Richard demonstrates how to handle simple clogs in a bathroom sink, kitchen sink and toilet using different mechanical devices and the proper techniques. When using a plunger he recommends creating a seal with the flange and pulling back on the plunger allowing the clog to break up.
A closet auger is used for toilet clogs and has a protective sleeve to ensure that the porcelain toilet isn’t damaged. K-3 Toilet Auger [amzn.to/3D1N9oY] manufactured by Ridgid. www.ridgid.com/

The water pressure produced by a drain bladder can scour away the material left in place by a drain snake [amzn.to/36a0sYN], in this case one made by Cobra Tools. www.cobratools.com/tools/

About Ask This Old House TV: From the makers of This Old House, America’s first and most trusted home improvement show, Ask This Old House answers the steady stream of home improvement questions asked by viewers across the United States. Covering topics from landscaping to electrical to HVAC and plumbing to painting and more. Ask This Old House features the experts from This Old House, including general contractor Tom Silva, plumbing and heating expert Richard Trethewey, landscape contractor Jenn Nawada, master carpenter Norm Abram, and host Kevin O’Connor. ASK This Old House helps you protect and preserve your greatest investment—your home.

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How to Unclog Any Drain | Ask This Old House
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All Comments (21)
  • @ecpoirier
    Nothing is more appreciated, than a knowledgeable person sharing their expertise to make the lives of their audience better. thank you.
  • @LY43537
    You know, I've always been jealous of people who had dads/guardians who taught them basic life skills like how to properly snake a drain since I never had anyone to help me like that. Thanks, This Old House, for filling that void.
  • I worked for a company with 800 vacation rentals. I got a call every other day about a clogged toilet. The guests would say it's no use, they'd already plunged it. Well, they should have done it like Richard at 1:02 because that's the right way. Actually, don't pull it that hard unless you like poop in your face. No more than two or three "pulls", not pushes, and the clog is gone. And clogged tub? It's hair. It's always hair. It's never anything but hair. Unscrew the popup or pull out the tub drain linkage. Then use needle nose pliers. As I would tell folks, "Look, I pulled out the entire cat." Same for bathroom sinks. It's always hair. Unscrew the popup lever under the sink with a pair of channel locks, pull out the stopper, needle nose pliers down the drain and pull out that fur ball. Good to go.
  • @imgadgetmanjim
    My dad was a plumber/steamfitter and I went on plenty of jobs with him. Tip: if you are blocking the overflow hole to use a plunger it is more effective to use wet rag than a dry one.
  • @kirkanos3968
    Man i thought they upped a old video but no ! i need to get out the archive and watch them side by side lol . Pretty sure was video was right after Kevin O’Connor got help taking down old wallpaper in his old house then became the new host next season. I love these guys so much years and years helping people
  • I work for a state park system. We've been using those black expanders for like 15 years. They work so well. Love them and swear by them.
  • A note about the rubber bladder...You need to make sure you're using it in front of any branches in the plumbing behind the clog. Otherwise you will shoot water up and out of a plumbing fixture...could be a flood if you're not paying attention!
  • This show/channel is absolutely PRICELESS for homeowners. I've been watching TOH since I was a child though lol. I love this stuff.
  • @insultobot
    More of this style of real information in a usable everyday scenarios. Bravo
  • @d.a.s.s4614
    All great advice. As a municipal maintenance tech ive used all of these options plus a couple more. One thing to note about the rubber bladders is they work well but make sure that no chemicals/ acids have been tried first. The rubber and acid do NOT mix. The acid can cause the rubber bladder to deteriorate and burst...often while being used under pressure. Not fun!
  • I love you guys! I've been watching you for 40 years and you always have a solution to help me with my DIY fixes! Thanks!
  • @wellsnapyeah
    That was jammed packed with great information. Thank you.
  • @weston.weston
    I enjoy this show so much, I've been watching for over 15 years.
  • @debluetailfly
    I learned about a wet vac a long time ago. Plug up overflows in sink and other nearby sinks or tubs with wet rags, fill with water, place end of vacuum hose over drain, open sink drain, turn on vac. You will be surprised at all the nasty deposits that come out of the drain. I have also sucked out things from drains without drain guards, such as toy cars and plastic grapes. You can repeat if need be. May as well do nearby drains while you have your tools out.
  • @Mark_Nadams
    Thanks for the caution given about chemical drain solutions. It is often the go to solution of a home owner. The danger to the repairman is real. I was on the receiving end of a caustic flood once a long run drain was cleared. I had no way to get clear of the flow on a ladder and ended up with chemical burns everywhere it touched.
  • @jimholmes2555
    I love the patina on the old Waterloo tool box in the background.
  • @Mithinco
    Thanks for the useful and valuable information!
  • @rgp6364
    Wonderful presentation! Thank you!
  • Thank you for this important video! I needed this information! Enjoyed from Texas!