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The Basics Of Sink Plumbing In The Bathroom

Looking at doing renovations or want to know more about bathroom plumbing? We have prepared the ultimate guide of sink plumbing in the bathroom.

It can be challenging to describe your issue to a plumber for those who don’t know much about plumbing. By understanding the different plumbing parts and plumbing fixtures in your bathroom and what they do, you can more accurately describe your bathroom sink plumbing requirements to a plumber.

This will help them get to the root of the issue quicker and provide better service for you.

Bathrooms can contain many different drains and fixtures. Perhaps more than any other room in your home. You have your main drain, bathroom sinks, sink faucets, and shutoff valves, to name a few. When you consider that you may have a bath, shower, toilet, sink, or sometimes two – that’s a lot of plumbing in one room.

Bathroom Plumbing Basics

Let us break the basics of sink plumbing down for you. Read on for a guide to the basics of sink plumbing in the bathroom.

Shut Off Valve

Shut-off valves are part of most plumbing systems. You can use them to quickly shut off the water from sections of your pipes for repairs and maintenance.

While there are many valves you may use, you will depend on your plumbing system. Many shutoff valves use compression fittings to be installed onto the water pipes without soldering. But you will have to turn off the water to the house to replace a shutoff valve.

Regardless of the type you find in your home, they all serve the same function of shutting off the water.

If you experience a leak, for example, in your sink faucet or under your bathroom sink, then you can quickly shut off the valve. The shutoff valve will further prevent water from dripping and damaging your vanity unit.

When you decide to replace a tap or water line, it is a good idea to simultaneously replace the valve and the narrow supply tubes. If your faucets are getting old, worn out and leaky, your valve may also be.

Water Supply Pipes

Water supply pipes that run through the bathroom wall or floor are those used to send potable water to your taps. If you need to shut off the water, they will link to the valves.

These pipes can be made of numerous different materials and include Flexi hoses. Here are some popular options:

Galvanised Steel

These pipes are crafted from steel and then covered with a zinc coating. The coating will prevent the pipe from eroding from water flowing through it. These pipes used to be extremely popular, but superior options are now available. However, you may still find it in some older homes built before the 70s.

These pipes can last in your home for up to 50 years. After that, they are unlikely to remain an effective way of accessing water supply, and you should consider replacing them.


Copper pipes are usually used for cold and hot water systems. They used to be often installed for piping gas, although this is no longer true. They function well both above and below ground. However, using them underground may require a protective sleeve to prevent corrosion.

Copper pipes also can last for up to 50 years. However, as time passes, they may start thinking. This can lead to tiny leaks, which can have enormous consequences. Such little leaks are tricky to locate and, therefore, fix.

This is largely why copper has fallen out of favour, giving way to plastic pipes in our homes.


PVC stands for polyvinyl chloride, and this type of pipe is currently wildly popular. They can be used in many situations, from water mains to drainage pipes.

They come in many thicknesses and colour options, which serve many purposes. For example, purple PVC pipes with black writing denote being used for reclaimed water.

When copper became less popular, PVC was one of the first plastic styles to replace it.

The drawback of PVC is that heat can affect it. While it’s fantastic for cold water, it’s not great for hot water.

Sink Pop-Up

When talking about a pop-up sink, this refers to parts both below and above the sink. These include a horizontal rod and a tailpiece. The rod pops up and down the sink plug or the sink stopper either up or down.

Remove the sink stopper and clean off any gunk if you need to unblock this drain.


Many plumbing fixtures contain a p-trap. The name comes from how it looks – much like the letter P.

The p-trap is the curved section of the pipe that holds water every time you use your bathroom drain.

The purpose of the p-trap is to prevent sewer gas from travelling up the pipeline and into your home. Gravity traps water in the p-trap and is a barrier against sewer gasses.

The p trap seals the drain’s opening, thus preventing nasty smells from entering your home through the pipes. However, it can be a prime place for sink clogs to build up because of the curve.

There are two sections to a p-trap: the u-bend and the trap arm. These two curved sections of pipe allow your sink to be connected, ultimately, to the sewer line. These can easily be replaced if you find them broken in your sink.

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Drain Waste Vent System

Basic Bathroom Plumbing Plan

The drainage system has a drain waste vent (DWV) system that carries away any waste from your bathroom. This includes sewage as well as water that has gone down the drain.

This is connected to the drain waste pipes, and any sink is connected to the main drain pipe. If you need to snake the drain in your bathroom, this is the drain pipe you will do it on.

It serves the vital purpose of maintaining the correct pressure in your bathroom plumbing. This will aid in your fixtures draining effectively.

Now that you know some of the terminologies for plumbing in your bathroom, you should be able to explain your plumbing issues better.

If you have problems with your plumbing and drain fitting, please call us at Fixed Today. We provide honest, no-nonsense quotes. You are quoted what you pay, as we don’t add hidden costs or fees.

When you contact us, we can have a local, professional plumber around on the same day to sort out your sink plumbing issues and provide your bathroom sink plumbing requirements. We provide friendly, efficient sink drain fitting and other plumbing services without cutting corners. Your satisfaction is paramount to us. Get in touch now to get all your bathroom plumbing sorted.

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