Soil & Waste Pipe

Our 110mm soil pipe and parts take a buildings sewage and wastewater, from sinks, baths, and other waste outlets, and feeds it into the underground drainage network.

Key Features

  • 3 soil and waste pipes in white, grey and black

    3 Colour Options

    Available in white, black or grey

  • an image of an overground pipe with a test tube icon over the top of it

    Long Lasting Corrosion Resistance

    Quality PVC-u and rubber

  • an image of a black overground pipe with a shield icon over the top of it

    Tough & Impact-Resistant

    Maintains integrity after impact

  • an image of an overground pipe connected to another pipe using the push fit system

    Simple Push-Fit Connections

    Designed for easy installation

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an image showing the underground and overground system of a 110mm waste pipe

A full waste management system.

We sell an extensive range of guttering, downpipe, soil and waste management systems for domestic, commercial and industrial applications. They are registered in England and achieve some of the highest business management standards(ISO 9901, ISO 14001, OHSAS 18001, ISO 50001).

When fitted to building regulations, certified products, like the Kayflow 110mm soil and waste fittings will provide reliable, maintenance-free performance, year-after-year. Certified to BS EN 1329-1: 2014 Plastic Piping Systems for Soil and Waste Discharge.

24 products

FAQ

What is the difference between a soil pipe and a waste pipe?

Soil pipes carry soiled water (blackwater) from toilets, urinals, or bidets, while waste pipes transport wastewater (greywater) from sinks, showers, baths, and washing machines to the main sewer or a treatment facility.

What size soil and waste pipes do I need?

Soil Pipes: 110mm diameter for toilets, urinals, bidets, and soil stacks.

Waste Pipes: 32mm for small hand basins; 40mm for sinks, showers, baths, washing machines, and dishwashers; 50mm for commercial applications or connecting multiple waste pipes.

Soil pipes are larger to accommodate solids, whereas waste pipes handle only liquids.

What is a soil stack?

A soil stack is a vertical 110mm soil pipe that connects interior soil and waste pipes, directing waste to the main sewer or an off-mains system. It often extends above the roofline to vent gases and balance air pressure.

What is the difference between a soil stack and a waste stack?

A waste stack is a vertical pipe (typically 50mm) that collects discharge from sinks, showers, and similar appliances. A soil stack serves the same purpose for toilets and similar fixtures. In many properties, both systems connect to a single vertical pipe.

What is a soil vent pipe?

A soil vent pipe (SVP) is a segment of the soil stack that extends above the roofline, allowing harmful sewer gases to vent safely into the atmosphere and helping to balance air pressure within the system.

What is an air admittance valve?

An air admittance valve (AAV) is a one-way mechanical valve that permits air to enter the soil and waste system to maintain atmospheric pressure while preventing the escape of foul gases.

What is the difference between a soil vent pipe and an air admittance valve?

Both devices help balance pressure in soil and waste systems. However, a soil vent pipe releases sewer gases into the atmosphere, whereas an air admittance valve allows air in but does not let gases escape.

Is push-fit better than solvent weld for waste pipes?

Push-fit systems are quicker and easier to install, ideal for DIY projects. Solvent weld systems create a permanent bond, offering durability and leak resistance, making them suitable for long-term installations.

Can you connect waste pipes to a soil stack?

Yes, waste pipes can be connected to a soil stack using appropriate boss adaptors, regardless of the connection type or material of the soil stack.

Do waste pipes need to be connected to a soil stack?

Not necessarily. Waste pipes can connect directly to the main drain. However, systems not connected to a soil stack may require an air admittance valve to prevent negative pressure and ensure proper drainage.