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13 Plumbing Tricks of the Trade for Weekend Plumbers

Last updated: 07-12-2020

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13 Plumbing Tricks of the Trade for Weekend Plumbers

13 Plumbing Tricks of the Trade for Weekend Plumbers
Family Handyman Updated: Oct. 16, 2018
More than any other type of home improvement job, plumbing can drive a DIYer crazy. Problems arise, projects grow, frustrations multiply. Even pros are not immune. But one way to manage the frustrations and achieve a successful plumbing project is to allow plenty of time-at least twice as much time as you think the project should take. Another smart step is to learn some tricks of the trade. Here are a few of our favorites.
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Reheat Solder When You Can't Cut a Pipe
The best way to disconnect a soldered pipe is to cut it. But sometimes you can't—either because you can't get a cutting tool into the space or because cutting would leave the pipe too short to make a new connection. The solution is to heat the joint and pull off the fitting as the solder melts.
Have a wet rag handy and immediately wipe away the molten solder before it hardens. (Wear gloves to prevent burning your fingers!) Sometimes a quick wipe will leave the pipe ready for a new fitting. More likely, you'll have to scour off some excess solder with sandpaper or emery cloth before you can slip on a new fitting.
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Replace Metal Drain Lines with Plastic
Metal drain lines under sinks look a lot more reliable than plastic. But plastic is better in almost every way. It's cheaper, easier to install, and easier to adjust or tighten if a leak develops. And unlike metal, plastic won't corrode. So when a metal drain leaks, often the smartest move is to replace the entire assembly with plastic.
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Loosen Stuck Pipes with Heat
When a threaded connection won't budge, heat sometimes does the trick, especially on ancient connections that were sealed with pipe dope that hardened over time. Be patient. Getting the metal hot enough can take a couple of minutes. Protect nearby surfaces with a flame-resistant cloth. This method is for water and waste pipes only, never for gas or fuel lines. Find out how to open up a stuck cleanout plug, too.
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Piggyback Stubborn Shutoffs
Shutoff valves under sinks and toilets have a rotten reliability record. Sometimes they won't close completely; sometimes they won't close at all. In either case, there's an alternative to replacing the shutoff. Most home centers carry “piggyback” shutoff valves that connect to existing shutoffs. Just disconnect the supply line and install the new valve (a new supply line is a good idea, too). If the old shutoff closes most of the way, you won't even have to turn off the main water valve; just set a container under the valve to catch the trickle while you work.
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Fix a Clog in Seconds
Before you run a drain snake into a clogged pipe or disassemble the trap, there are a few other tricks worth trying: Often, you can yank out a clog with a flexible-shaft pick-up tool (shown above) or a Zip-It (below). Likewise, a wet/dry vacuum just might suck out the clog.
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Don't Overtighten Supply Lines
It's tempting to crank supply lines on tight, just to be safe. But overtightening supply lines is actually riskier than undertightening. A loose connection that leaks is easy to tighten, but overtightening can wreck rubber seals and crack the threaded nuts. So get into this habit: Make the connections at both ends of the supply line finger-tight, then give them another one-eighth to one-quarter turn with pliers. If they leak, snug them up a little more.
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Don't Reuse Supply Lines
When you're replacing a toilet or a faucet, you can save a few bucks by reusing the old flexible supply lines. But don't. Plastic degrades over time, and even a small leak can lead to catastrophic water damage. It's a small risk, but not one worth taking. Buy new lines that are encased in braided stainless steel; they're much less likely to burst. But even if you already have braided lines that are several years old, replace them.
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Tips for Using Thread Tape
Tape and dope are equally reliable for sealing pipe threads. The main advantage of tape is that it won't smear onto your hands or tools and end up on the carpet. Here are some tips for tape:
Cheap tape works fine, but the thicker stuff (often pink for water, yellow for gas) is easier to handle and tears more neatly.
Unlike dope, tape is for pipe threads only. Don't use it on compression or other connections.
How many times should you wrap around the pipe? There are no rules, but the most common answer we got from pro plumbers was three.
Always wrap the tape clockwise around the threads. Otherwise, the tape will unwrap as you screw the joint together.
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Cut Stubborn Parts
Corrosion and mineral deposits have an amazing power to lock parts together, making them almost impossible to disconnect. Often, the best solution is to cut the stubborn part. Either slice it off or cut kerfs in the part so you can break it off. A hacksaw blade works well. Oscillating or rotary tools work even better.
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Choose Caulk, Not Putty
Despite the name, lots of plumbers never use plumber's putty. It damages some types of plastic and stains surfaces such as natural stone. Plus, it tends to dry out, crack and allow leaks. Silicone caulk is a safer, longer-lasting sealant in most areas where you might use plumber's putty.
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Dope Everything
Thread sealant (aka 'pipe dope') is formulated to seal threads. But it's great for almost any connection, even if the threads don't form the seal. Use it on compression fittings, ground fittings and rubber seals. Because it's slippery, it allows connections to slide together correctly for a good seal. And, if you use a type that doesn't harden, disassembly and repair will be easier years later. Some types of dope harm plastic parts, so check the label.
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Don’t Fight It, Replace It
If you feel a groove where the O-rings mate to the spout, the faucet is toast. Don’t waste any more time and energy on O-ring repairs—you’ll never get a long-lasting seal. Replace the faucet.
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