Kitchen sink waste buying guide

Kitchen sink waste buying guide

Jeremy, construction site supervisor, Cardiff

Guide written by:

Jeremy, construction site supervisor, Cardiff

134 guides

Kitchen sink wastes are used to drain water from your sink and comprise a strainer, plug and trap. These systems may be made of plastic or metal, fitted with an in-built overflow or washing machine connector, and made to fit a single or double bowl sink. Plug sizes also vary and should be chosen to match your sink.

Important features

  • Material
  • Single or double bowl sink
  • Diameter
  • Plug
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Whether you have a single or double bowl kitchen sink, it has to be fitted with a drainage system that is connected to your home wastewater network.

This system is made up of a basket strainer, a strainer body and a waste trap.

Strainer basket

Strainer baskets are designed to filter solid material and waste to stop it from entering your pipes and causing blockages and clogging. These components are removable and easy to clean.

Strainer body

The strainer body is that part of the system that links the sink to the trap. It is screwed into place and is used to hold the strainer basket.


The trap is used to catch heavy debris before it enters your pipes – this is particularly handy if you tend to drop your wedding ring or jewellery down the sink! - The trap is constantly filled with a small amount of water which acts as a plug to stop unpleasant odours from rising out of the drain.

All these components play three roles: they protect your pipes, prevent objects from entering your pipes and stop unpleasant drain odours from infiltrating your kitchen.

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Waste traps

There are two main types of drainage systems depending on the type of sink you have:

  • wastes for single or double bowl sinks;
  • wastes for single or double bowl sinks with overflow.

Your sink might also be equipped with a pop-up plug. Pop-up plugs – just like those in your bathtub or wash basin – are operated using a rod or lever which opens and closes the plug. In this case, you'll need to ensure that your waste system is compatible with the plug mechanism.

This system allows you to open and close the plug with a touch of a finger! Otherwise you can go for a traditional rubber plug.

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Kitchen sinks

Technically, kitchen sink wastes are fairly straightforward systems. However, you need to pay attention to a few factors to ensure that your drainage system will work as expected.

Diameter of the plug

The diameter of your plug outlet:

  • 90 mm for porcelain, resin or stainless steel sinks;
  • 60 mm for porcelain or resin sinks;
  • 50 mm for stainless steel sinks.

Number of bowls

The number of sink bowls:

  • single bowl;
  • double bowl (two wastes);
  • 1.5 bowl;
  • double bowl (one waste).


The overflow of your sink(s) prevents overflowing and allows excess water to drain away into your pipes. Overflows come in two different types:

  • external overflow;
  • integrated overflow (requires a specific mechanism).

Washing machine connection

Waste traps can be equipped with a washing machine connector designed to link your washing machine or dishwasher to your sink waste. The waste pipe must have a special inlet designed to attach the hose; this is usually found near the overflow.

Pop-up sink waste

Sink plugs come in a variety of forms including:

  • a manual plug without any rod or lever on the sink; a basic rubber plug attached to a chain;
  • pop-up sink wastes with a lever or rod;
  • click-clack plug for compatible sinks.

In addition to these different components, kitchen sink wastes can vary in terms of material. Each material has its own set of advantages and disadvantages.

Kitchen sink waste materials





Easy to assemble

Easy to clean

Easy to remove and replace

Flexible for easy assembly


Plastic can harden over time making these components fragile and breakable

Limited service life


Long service life


Resistant to cleaning products

Inflexible; can make assembly trickier

Must be assembled flawlessly to ensure watertight seal

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When it comes to choosing a waste for your sink or sinks, choose a system and material that will be easy to clean and replace in case of breakage or major blockages.

Generally speaking, most waste systems are assembled using washers. It's a good idea to stock up on washers so you can quickly fit new washers in case of leaks.

In case of clogging or blockages, remove and clean the waste trap. This should usually be enough to get your water draining again.

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Guide written by:

Jeremy, construction site supervisor, Cardiff, 134 guides

Jeremy, construction site supervisor, Cardiff

Electrician by trade, I first worked in industrial estates where I installed, wired and fixed a large number of electrical installations. After this, I managed a team of electricians for this type of work. 10 years or so ago, I turned to building and construction. From the modest family home, to gyms and theatres; I have been able to coordinate, audit and organise all sorts of construction sites. for 4 years now, I am restaoring and bulding an extrension to a bungalow in the heart of the welsh countyside. My experience in manual work and my knowledge means I am proud to be of service. Terraces, interior design, roofing, plumbing, electricty, anything goes! We have, my wife, daughter and I, built almost everything we have from scratch! So to answer all of your questions, and to orientate and advise you on coosing your tools? Easy!

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