Soil Pipe & Fittings

We stock soil pipes that are both Push Fit as well as Solvent ranges in black and grey which are some of our top sellers. All our soil pipes are sourced from a UK manufacturer and are all tested and approved for use as shown by their British Kitemark. We’ve selected these plastic pipes due to their excellent mix of high quality and low prices.


What are soil pipes?

This type of pipework normally filters wastewater content from a toilet, bath or sink from within the home drainage across to the sewage treatment network. 

These drainage systems are normally made of plastic although can be made with different materials; such as cast iron. 

How do you connect it to the sewer?

To get your plastic soil pipes to the network of sewage pipes underground, you will need the following hand tools and materials:

  • Drill, screwdriver, plumbline, spirit level, hacksaw, tape measure, silicone spray, workbench, marker pens, work platform, hi-visibility jacket, hard-hat and gloves.
  • Firstly, install the internal fittings that will lead to the external pipes and connect with this.
  • Begin removing the existing pipes and fitting that is on the outside, beginning at the top and working your way down.
  • Once removed, you will begin installing the new pipes, branches and bends beginning in the reverse order, starting from the ground and working up to the top.
  • Cut the pipes ensuring the downspout diameter and length is correct and connect using a silicone lubricant to make the fitting easier.

We carry a host of stack accessories and have a wide range of other components available - with offers running including channel drainage, channel grates, rubber seal and filter components, work tools and much more!

How do you fit pipes to connect to a toilet?

picture of vent stack installed on the side of a house

Soil pipes will also have boss connections for attaching smaller size stack components to carry fluid from the showers, sinks, and appliances such as a washing machine, along with the services of a property. The stack would then run upwards to just above roof gutter level where an air admittance valve will be installed to allow the system to 'breath' - preventing any vacuum and allow the water to flow correctly. They are most commonly black, but they do also come in a grey or white.

There is a range of decorative colours which we can bring in, so if you're after a specific specialist colour or require other soil pipes accessories or soil pipe options - or just some further support, then let us know - and one of our expert customer care agents will be happy to assist - whichever drainage products you need help with.

Picture of a 110mm push fit triple socket t 90 degree junction branch in black

Soil pipes generally come in various sizes ranging from 3 inch to 6 inch in diameter depending on what is required. These are 75mm, 110mm and 160mm in metric, and are supplied in 3m or 4m lengths with the best seller being the x3m length 110mm diameter. The size you need will depend upon the outlets and inlets you need to join to, and the amount of water that will be transported through it.

A standard domestic property will usually use a 110mm diameter (or 4 inch) stack, which would join into a standard pan connector, and into a standard 110mm diameter underground sewer drainage system.

How do we connect them together? Do they need to be glued?

Black Swan Cleaning Fluid 118/236mlpipe lubricant for underground sewer pipe drainageblack swan pvc solvent cement

The two most common ways of joining these lengths together are ring seal joints (double or single socket), which are joined together by pushing the joints together where a lubricated watertight join prevents leakage or by solvent weld, where a solvent glue will be used to 'meld' the joints together. Ring seal soil pipes are easily separated in the future - but when you use specialist cement, you create a permanent join that cannot be separated. 

We keep in stock both push fit soil and solvent weld soil pipes ranges in 110mm, in black and grey.

Additional Information:

Approved document H: Requires that the foot of a vent stack should have as large a radius as possible, rather than less than 200mm at the centre line. Offsets must be avoided in the wet section of the stack.

The runs should complete at least 900mm over any opening within 3m and should be completed with a wire cage or other perforated cover. The lengths must keep sufficient downward slope in their length to keep liquids and solids flowing freely towards the drain. Air must be allowed into the system either via a vent cowl or an admittance valve.

Can I connect PVC waste to a cast iron stack?

picture of a cast iron vent stack

This is a question we're commonly asked here at EasyMerchant.

Lots of our customers want to replace their old cast iron system and add a new PVC system. Normally the installer would have to dig up the existing concrete to replace the drain connection.

Luckily, specialist parts are available allowing the installer to cut the lengths, fit the adaptor and replace the rest of the system with uPVC. Please get in touch so we can source this if needed, as well as others - such as air admittance valves.

We pass on bulk discounts for all products

At EasyMerchant, we make sure we purchase all our plumbing parts in large quantities - making sure we secure the largest possible discount when we do. We pass this discount on to our customers - so you can be certain you're getting an outstanding price, whether you're purchasing a single item, or buying materials for a a number of jobs. Always great prices for UK-made, high-quality, kite marked products.