PVC Pipe Fittings Sizes

Understanding the Differences: 20mm, 32mm, and 90mm PVC Pipe Fittings

PVC pipe fittings come in a wide variety of sizes to accommodate different plumbing needs, from small indoor projects to large-scale water systems. Among them, 20mm, 32mm, and 90mm PVC pipe fittings are commonly used in domestic, commercial, and municipal settings. In this article, we compare their features, applications, and installation methods to help you choose the right fitting size for your project.

1. 20mm PVC Pipe Fittings – Compact and Versatile

20mm PVC pipe fittings are designed for lightweight applications. Their small diameter makes them ideal for:

Garden irrigation systems

Low-flow water distribution

Small appliances or fixture connections

DIY plumbing setups

Features

Easy to handle and install

Compatible with standard 20mm PVC-U pipes

Suitable for low-pressure systems

Budget-friendly and widely available

These fittings are a popular choice for hobbyists and home improvement enthusiasts who need precision and flexibility in tight spaces.

2. 32mm PVC Pipe Fittings – Standard for Household Drainage

32mm PVC pipe fittings are one of the most commonly used sizes in household plumbing. They are perfect for waste water discharge and vent systems, especially in kitchens and bathrooms.

Typical uses include:

Sink and basin drainage

Small-scale greywater systems

Rainwater downpipes

Compact commercial plumbing

Benefits

Medium flow capacity

Smooth interior for better drainage

Corrosion and chemical resistant

Compatible with both solvent weld and rubber ring joints

Their moderate size offers a balance between space efficiency and performance, making them ideal for internal drainage systems.

3. 90mm PVC Pipe Fittings – High-Flow and Heavy-Duty

When it comes to high-volume flow or main line water transport, 90mm PVC pipe fittings are the go-to option. These larger fittings are commonly found in:

Municipal drainage systems

Commercial buildings

Outdoor rainwater collection systems

Agricultural piping

Advantages

Handles high water flow rates

Durable and impact resistant

Suitable for underground and above-ground use

Available in a full range of elbows, tees, couplings, reducers, and end caps

Their large size and structural strength make them suitable for handling long pipe runs and intensive usage.

4. Installation Methods for Each Size

20mm and 32mm fittings are usually connected using solvent cement, ensuring a strong, leak-proof seal.

90mm fittings may use solvent welding or rubber ring/socket joint connections for larger pipe runs and easier maintenance.

Regardless of the size, all fittings must be cleaned and properly aligned before connection for the best performance.

Choosing the Right PVC Pipe Fittings for Your Project

Selecting the correct PVC pipe fitting size is essential for the safety and efficiency of your piping system. 20mm PVC pipe fittings are great for small-scale plumbing and DIY projects, 32mm fittings suit standard domestic waste and drainage systems, while 90mm fittings are ideal for high-flow applications in larger buildings or infrastructure. No matter the size or application, PVC-U fittings offer excellent durability, ease of installation, and cost-effectiveness. If you're unsure which size is best for your project, feel free to contact us for technical support and product recommendations.

No matter your need, PVC-U fittings offer excellent resistance to corrosion, easy installation, and low maintenance. Looking for high-quality PVC fittings at competitive prices? Contact us today for product recommendations, bulk pricing, or technical support.

FAQ

Q1: What is the difference between 20mm, 32mm, and 90mm PVC pipe fittings?

A: The main difference is the pipe diameter they are designed for. 20mm is for small-scale or branch pipelines, 32mm is commonly used in indoor drainage and water outlets, while 90mm is used for main lines or systems with higher flow rates.

Q2: Can I glue 32mm PVC pipe fittings myself?

A: Yes, solvent cement is commonly used to install 32mm PVC fittings. The process is simple and suitable for DIY users, but ensure both surfaces are clean and dry before applying adhesive.

Q3: Are 32mm PVC fittings suitable for hot water?

A: Standard PVC-U fittings are generally used for cold water and drainage. For hot water systems, consider using PPR or CPVC fittings instead.

Q4: Do 32mm fittings work with pipes made from other materials?

A: No, PVC fittings are designed to work specifically with PVC pipes. Using them with metal or other plastic types can result in leaks or fitting failure.