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Now, it’s time to put the hoses back on. Trethewey uses pliers to tighten the two brass adapters, then reattaches the hot and cold water supply hoses to the threaded connections on the automatic shutoff valve.

An automatic washing machine shutoff valve gives you an extra layer of protection against flooding and water damage. It detects when you’re actively washing clothes and only allows water to flow when the washer has a cycle running. Modern versions of the device can even detect leaks and shut off the water supply in advance. In the above video, This Old House plumbing and heating expert Richard Trethewey shows how to install one for added peace of mind—and potentially even lower insurance premiums. Learn more in our guide below.

Incorporating these precautions can prevent any accidents or damage during installation. It’s also beneficial to inform anyone in the household about the ongoing work to avoid disturbances.

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The automatic valve Trethewey uses has a leak sensor that goes on the floor behind the washing machine to detect moisture. He plugs it into a designated port and places the sensor in a strategic spot, close enough to detect even minimal water presence.

Finally, Trethewey reopens the water supply and starts a test cycle for the washer. A light on the valve indicates that the washer is on. If the pressure on the hoses releases when he pauses the fill, the installation is complete.

Trethewey can now hold the valve assembly against the wall and mark where to cut the straight piping so the valve fits just outside the outlet box.

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South End Plumbing specializes in all plumbing leak repairs, so remember, we are just a click away. We also specialize in leak detection – give us a call! South End Plumbing is one of the only companies that will give you a free estimate. Call us at 704-919-1722 or fill out the form online to schedule a visit.

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When Brass Fittings Can Be Used Brass fittings and nipples are also frequently used as a great alternative to dielectric unions for plumbing. When galvanized water is exposed to particular water qualities, rust is produced and to prevent that from corroding, fittings made of brass are often used. Both dielectric unions and brass are approved for usage throughout plumbing systems, however, brass is utilized where bad water quality exists and galvanized materials have a high chance of getting worn away. Brass is a malleable alloy of copper and zinc that has actually remained in use for centuries. Brass fittings are manufactured to IPS and NPT standards and are extremely well-compatible with threaded adapters made from other metals and composites.

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The automatic shutoff valve has both a power cord for the wall socket and its own receptacle on the front face. When Trethewey plugs the washer’s power cord into the valve, it ties the valve’s position to the washer’s power draw. A light on the valve lets him know the valve is ready to work.

After everything’s primed, Trethewey uses PVC cement to join the pipe assemblies together, following the manufacturer’s instructions.

Automatic shutoff valves can be bulky, so they commonly have space for fasteners. Trethewey makes two marks on the wall over the outlet box, predrills the holes, inserts hollow-wall anchors, and attaches mounting screws to secure the valve assembly in place.

First, Trethewey closes the hot and cold water shutoff valves that supply water to the washer and disconnects the supply hoses from the valves with pliers. It’s best to have a rag ready so you can catch any water that spills from the hoses.

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Many automatic shutoff valves come in a kit that can connect to the existing valve with adapters. Trethewey temporarily installs the brass adapters on the existing shutoff valves and inserts 1/2-inch PVC piping into the ball swivels inside the adapters. Then, he attaches 1/2-inch PVC elbows to the brass connections on the underside of the automatic shutoff valve.

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Once Trethewey has the measurements and marks he needs, he uses a tubing cutter to trim the pipes to the correct length. Then, he cleans the cut ends and the inside of the elbows with PVC primer.

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To stop this from occurring, a unique adapter is utilized to separate the two metals by using an elastomeric rubber gasket in between the dissimilar metals. This special fitting is called a dielectric union. When connecting copper pipe to galvanized iron pipeline for example, a dielectric union is installed to hold the 2 different metal pipelines together. However, there’s yet another alternative to a dielectric union– a brass nipple or a brass fitting which likewise certifies as a copper alloy fitting and complies by building codes too. So should you utilize a dielectric union or a brass fitting to link two different metal pipelines? Let’s see how they differ in their properties and performance.

A dielectric union is a special adapter or fitting utilized in the piping systems of various metals to isolate the connection of the dissimilar metals. For instance, when linking a copper pipeline to a galvanized iron pipe, a dielectric union is set up between the two to hold the two different metal pipelines together. An elastomeric rubber gasket seals the connection to prevent any water leak and a plastic composite material isolates the copper tube connection to hex nut on the dielectric union. Different metals begin to corrode when they can be found in contact with each other. The small quantity of acid on water sets off the electrolytic response between the two metals causing electrons from one metal to stream to the other. This ultimately results in galvanic corrosion. To stop this from taking place, a dielectric union is used to sign up with the two dissimilar metal pipes.

The 1" and 1-1/4" o-rings part number both have 140 in them. This is an o-ring size, -140. Looking that up here are the dimensions below.

There’s a lot of plumbing around the house that normally different pipes to tap into each other; to set up a bar sink, for example, or possibly to include an additional outlet hose bib, even water heater connections fall into this category. Plumbing work frequently requires connecting one piece of metal into another. This is made possible with using the proper types of joints and unions. Understanding the correct parts and how to use them can really make the difference. When two different metals come in contact with each other, an electrolytic reaction begins, where water serves as the electrolyte. As a result the metals start to corrode. This unique process is called galvanic corrosion.