Understanding DN Measurements in Drain Cleaning & Plumbing

At Pipemade.com, we know that clarity is key when it comes to selecting the right tools for your plumbing tasks. That’s why we use DN measurements alongside the more familiar imperial inches in our Chain Knocker and CIPP products. But what does DN actually stand for, and why is it important?

What Does DN Mean?

DN stands for Diameter Nominal. It’s a European designation used to describe the approximate internal diameter of pipes and fittings in millimeters. Unlike imperial measurements, which provide a precise measurement in inches, DN is a nominal (or approximate) size that helps standardize fittings and tools across different regions and manufacturers.

Why DN Matters?

Understanding DN is crucial because it ensures compatibility between different components, whether you're dealing with pipes, fittings, or tools like our Chain Knockers. DN measurements help you identify the correct size, ensuring a snug fit and optimal performance in your plumbing system.

DN and Imperial Inches: A Quick Reference

To make it easier for our customers, we list both DN and imperial measurements on our products. Here’s a quick reference for some common sizes:

• DN30 (1 ³⁄₁₆”)
• DN32 (1 ¼”)
• DN40 (1 ⁹⁄₁₆”)
• DN50 (2″)
• DN75 (3″)
• DN100 (4″)
• DN150 (6″)
• DN200 (8″)
• DN250 (10″)

You can go and see our Chain Knocker products and notice they all have the DN measurement and the measurement in inches inside brackets

Choosing the Right DN Size

When selecting tools and fittings, always consider the DN measurement to ensure you’re getting the correct size for your pipework. Matching the DN size with your pipe’s internal diameter will help you achieve a secure, efficient connection, reducing the risk of leaks or system failures.

At Pipemade.com, we’re committed to providing drain professionals and plumbers with the highest quality tools, designed to meet international standards.