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.


More Information:

What is a Soil Pipe?

soil pipe (sometimes known as a vent pipe, stack pipe and 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 soil pipe would then run upwards to just above roof gutter level where a vent will be installed to allow air flow to stop a vacuum and allow the water to flow correctly. Occasionally the soil 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.

Soil products are most commonly made from plastic (PVC) as this makes them easy to work with, light weight and cheaper than their cast-iron alternatives which are heavy, expensive and difficult to manage.

How does it work?

As mentioned above the soil 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 air flow and oxygen into the system. The bends and junctions come as double or single socket. The joints in the push fit system incorporate a rubber seal, or you can order the solvent system which is glued together using solvent cement.

What Size Pipe do I need?

Soil 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 Soil Pipe. 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) soil 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. At Easymerchant we stock black and grey, and can source white when necessary. There are other decorative colours available such as green, cream, beige, blue etc – however demand is low and lead times are high. 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 Soil Pipes together?

The two most common ways of joining soil 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.

High quality 110mm soil pipe systems available in black & grey.

Soil pipes run vertically from the underground system, up the side of the property to the roof level. It's the pipe that carries water down into the sewer system. The toilets and the soil pipe by means of a connector will connect together, and water from this property's sinks, bathrooms, showers and appliances will be connected from the plumbing system into the soil pipe via a boss connection.

Soil pipe is sometimes called vent pipe, because at roof level a port will be installed to allow air flow into the system, preventing a vacuum and releasing gasses and any scents.. We keep in stock both push fit soil and solvent soil ranges in 110mm, in black and grey.

Traditionally, soil vent pipes were made out of cast iron, now they are most commonly manufactured from uPVC (plastic). Soil pipes permit the removal of foul water from bathrooms, showers, baths and sinks, while also allowing odours to be expelled over the construction via a stack vent, at a level that where the smell released will not cause a nuisance. The pipe's vents also allow air into the underground sewer system in order to facilitate the process of aerobic sewer digestion, preventing a siphoning effect from occurring, and allowing free flow of water. If used on the interior of the building, then an air admittance valve will be necessary.

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 Soil Pipes Made From?

uPVC is currently the industry norm in house soil pipe 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 soil pipe that is hefty and deadens the noise of flowing water very well. This pipe is strong and long-lasting but tough to cut--frequently requiring a particular cutting tool with sharp string cutting wheels. Repairs are often made with PVC piping that's plastic. 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 give us a call if you need some, we will be able to source it for you.

Can I connect PVC soil pipes to a cast iron stack?

This is 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 call us if so we can source this fitting for you if needed.

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. You'll find fittings supplied in bags or boxes and we always take the up-most care when picking, packing and delivering our soil and vent systems, because they're in view of the customer when installed so we 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. Free delivery is available for all orders above £120/ex VAT.