DN/OD 40
Here you will find DN/OD 40 pipes, fittings and accessories for your house drainage pipe system. This common nominal diameter is suitable for specific connections and pipe routing inside buildings for wastewater drainage.
Buy DN/OD 40 — Guide & Tips
DN/OD 40 is a widely used nominal diameter in household drainage pipe systems. The abbreviation DN stands for nominal diameter, OD for outer diameter. Pipes and fittings with this dimension are used inside buildings to safely drain wastewater from sinks, showers, bathtubs, or washing machines to the main drain. The system is modular: you combine pipes, bends, branches, sockets, and seals according to the routing and connection requirements.
What should you look for when buying? The material quality is crucial. Common materials are HT (high-temperature resistant) for wastewater up to 95 °C and PE or PP for colder applications. HT pipes are optimized for continuous use with warm wastewater and are therefore the first choice in kitchens and bathrooms. Pay attention to the pressure rating and the correct seal type – NBR seals are oil-resistant, EPDM seals are universally applicable. Also check compatibility with existing connections: DN/OD 40 fits standard sanitary fittings and siphons. Measure the outer diameter of your existing pipes before ordering to avoid incorrect purchases.
Typical applications for DN/OD 40 are washbasin connections, sink drains, and condensate lines from heating systems. For main stacks or toilet drains, you need larger diameters such as DN/OD 110. DN/OD 40 is particularly suitable for branch lines with lower wastewater volumes. If you are planning a complete system, it is advisable to choose all components from the same material and manufacturer – this ensures precise connections and prevents leaks.
Popular DN/OD 40
Corrugated bead nipple DN/OD 40
Pipe connector for tight connection of wastewater pipes. Ideal for repairs and extensions.
NBR seal oil-resistant DN40
Oil-resistant seal for HT-Safe systems. Suitable for greasy and oily wastewater from kitchens.
These three products cover typical requirements: The corrugated bead nipple connects pipes without additional seals, the NBR seal provides oil-resistant sealing in the kitchen, and the HT sleeve seals existing connections retroactively. Depending on the location, you choose the appropriate accessory. For standard connections in the bathroom, a simple sleeve is often sufficient, while in the kitchen the oil-resistant variant is recommended. The corrugated bead nipple is particularly suitable for quick repairs as it can be installed without tools.
Frequently Asked Questions
What exactly does DN/OD 40 mean?
DN stands for nominal diameter (Diamètre Nominal), OD for outer diameter. DN/OD 40 refers to pipes and fittings with an outer diameter of 40 mm. This size is common in household drainage systems for branch lines. The specification helps to safely combine components from different manufacturers as long as the system is made according to the same standard. When purchasing, look for the marking 'DN/OD 40' on the product.
What is DN/OD 40 used for in the household?
DN/OD 40 is mainly used for washbasins, kitchen sinks, showers, and bathtubs. Condensate lines from condensing boilers or drainage from washing machines also use this diameter. It is sufficient for small to medium wastewater volumes. For main stacks or toilet drains, larger diameters such as DN/OD 110 are required. In a typical single-family home, most connections are made with DN/OD 40 or DN/OD 50.
What accessories are needed for DN/OD 40?
In addition to pipes and bends, you need sockets, branches, reducers, and seals. Each connection requires a suitable seal – usually made of NBR or EPDM. For repairs, corrugated nipple or sleeve repair couplings help without having to replace the entire pipe. Ensure that all parts are designed for the same material (e.g., HT) to avoid stress cracks. A selection of DN/OD 40 components makes stocking up for later extensions easier.
Can I combine DN/OD 40 with other diameters?
Yes, with reducers or transition pieces you can connect DN/OD 40 to DN/OD 32 or DN/OD 50. This is useful if you need to extend an existing line or adapt to a different nominal size. Note that reducers should always be installed in the flow direction and the seal must fit correctly. An overview of all available diameters and components can be found in the Household drainage system category.
Other categories
In addition to DN/OD 40, there are other diameters optimized for different applications. If you are laying smaller pipes for condensate or individual washbasins, DN/OD 32 is a space-saving alternative. For main stacks or connections with higher wastewater volumes, such as kitchen sinks or showers, we recommend DN/OD 50 . Both diameters are available in the same modular system and can be combined with suitable reducers.
The overarching category Household drainage systemprovides a complete overview of all available diameters from DN/OD 32 to DN/OD 160, as well as matching fittings, seals and tools. If you are planning a new wastewater installation, start there to see the full range and select the right dimension for your pipe routing. The choice of diameter depends on the number of connected drainage points and the pipe length – if in doubt, consult a professional.
In a nutshell
DN/OD 40 is the standard diameter for branch lines in household drains – ideal for washbasins, showers and condensate drains. The modular system of pipes, fittings and seals allows flexible installations. Pay attention to the material (HT for hot wastewater), matching seals and compatibility with existing connections. Our range includes 74 articles, including connectors, seals and sleeves specifically designed for this diameter. Combine DN/OD 40 with larger or smaller diameters using reducers and plan your pipe routing carefully.