Buy Soil Pipe Systems & Fittings

We keep in stock both Push Fit Soil Pipe and Solvent Soil Pipe ranges in black and grey. All items are sourced from a UK manufacturer and they’re all tested and approved for use as shown by their British Kitemark. We’ve selected these products due to their excellent mix of high quality and low prices.


Additional Information on Soil Pipe: What Exactly is a Soil Pipe, Anyway?

picture of soil pipes installed on the side of a house

A soil pipe (sometimes known as stack pipe or vent pipe) is the pipe that would usually connect to your pan connector that attaches to your toilet and would typically run externally down the side of the house or property and connect into the underground sewer system.

Soil fittings will also have boss connections for attaching waste pipe to dispose of water from the bath, sink, and appliances of a property. The stack pipe would then run upwards to just above roof gutter level where a vent will be installed to allow airflow to stop a vacuum and allow the water to flow correctly.

Occasionally the vent pipe will run internally, and in this case an air admittance valve will be required to allow air flow into the system while stopping air (and thus smell) from being released into the property.

How Does It Work?

As mentioned above the stack pipe is installed to transport water and sewage from upper floor toilets, baths and sinks and appliances into the underground system. However, the vents allow smells and odours from the plumbing and sewer system to be released into the atmosphere.

Placing the outlet at roof level means the odours are dispersed of somewhere where it won’t be smelt. The vents also help the process of aerobic sewage digestion by allowing airflow and oxygen into the system.

What Size Pipe do I need?

Stack pipes generally come in sizes from 3 inch to 6 inch, these are 75mm, 110mm and 160mm in metric, and are supplied in 3m or 4m lengths with the best seller being the 110mm x3m Drainpipe. The size you need will depend upon the outlets and inlets you need to connect to, and the amount of water that will be transported through the pipe.

A standard home will usually use a 110mm (or 4 inch) vent pipe, which would connect into a standard pan connector, and into a standard 110mm underground sewer system.

What Colours are Available?

The most common colour is black, followed by grey and then white. However, there are other decorative colours available such as green, cream, beige, blue, etc. So, if you’re after one of these decorative colours then feel free to call us and we’ll source them for you.

How Do We Join Vent Pipes Together?

The two most common ways of joining waste pipes together are push fit joints (double or single socket), which are joined together by pushing the joints together where a rubber seal prevents leakage. Or by solvent weld, where a solvent glue will be used to glue the joints together creating a permanent seal.

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

Building Regulations: Drainage and Waste Water Disposal

Approved document H: Requires that the foot of a soil and 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.

Ventilating pipes should complete at least 900mm over any opening within 3m and should be completed with a wire cage or other perforated cover. Soil and vent pipes must keep sufficient downward slope in their length to keep liquids and solids flowing freely towards the drain.

If a downward incline is not feasible, a collection pit using a 'sewer ejector' pump could be installed. It's frequently attached to the exterior of a construction (although it might be fitted internally) and connects the subterranean sewer system to a point just above the degree of this roof gutter.

What Are Stack Pipes Made From?

uPVC is currently the industry norm in house drainpipe manufacturing materials. It's a strong, chemical-resistant rigid pipe that is heat resistant and readily cut and fit. It's often used to fix segments of busted cast-iron pipe, in addition to repairs to additional drain lines. It also contains a UV stabilisation additive to avoid the products fading in the sunlight.

Cast Iron pipe is also still commonly found in the UK and is typically a high-quality drainpipe that is hefty and deadens the noise of flowing water very well. Cast iron is seldom utilised in new construction, in favour of plastic PVC or ABS (acrylonitrile butadiene styrene) pipe.

Currently we do not stock cast iron soil at EasyMerchant, but don’t hesitate to give our friendly and responsive support team a call if you need some, we will be able to source it for you.

Can I Connect PVC Waste Pipes to a Cast Iron Stack?

This is a question we're commonly asked here at EasyMerchant. Lots of our customers want to replace their old cast iron soil system with a new PVC system. Normally the installer would have to dig up the existing concrete to replace the drain connection.

Luckily, specialist fittings are available allowing the installer to cut the pipe, fit the adaptor and replace the rest of the system with uPVC pipe. Please contact us so we can source this fitting for you if needed.

Is Anti Modern Slavery Part of Your Policy Terms Conditions?

Yes. We’re dedicated to making sure that there is no trace modern slavery in all our supply chains or any part of our business.

How Are They Supplied?

Soil pipes come packaged in two's in a bag to avoid any scratching or blemishing on the outer face of pipe. We always take the up-most care when picking, packing and delivering our soil and vent systems to make sure they arrive in your hands in top condition.

Bends come as double socket or single socket. Junctions as triple or double socket, we also have double socket couplers and just about anything you'll need for any installation.

Order From Us for High Soil Pipe Systems!

We provide a comprehensive and technically advanced range of systems. Fast, Free delivery is available for all orders above £120/ex VAT. Feel free to create an account to keep up to date with the latest news, discounts, and offers.