How to Choose the Right Drainage Pipes & Connections

Reliable drainage starts with the right pipes and connections. Choosing the wrong material or fitting can lead to leaks, blockages, and costly callbacks — all things no tradie wants. Whether you’re installing stormwater, wastewater, or residential drainage, selecting the right components ensures every job runs smoothly.

In this guide, we’ll cover the main types of drainage pipes, key connections, and practical tips to make ordering and installation straightforward.

1. Know Your Materials: PVC, ABS, and HDPE

Not all pipes are created equal. Understanding the differences between materials helps you choose the right option for each application.

• PVC (Polyvinyl Chloride): Lightweight, affordable, and widely used for residential and stormwater drainage. Resistant to chemicals and corrosion.

• ABS (Acrylonitrile Butadiene Styrene): Slightly stronger than PVC, often used for indoor wastewater systems. Can be joined with solvent cement or push-fit connectors.

• HDPE (High-Density Polyethylene): Flexible and durable, ideal for outdoor and industrial applications. Resistant to ground movement and impact.

Pro tip: Always match pipe material with the correct fittings to prevent leaks and compliance issues.

2. Choose the Right Pipe Size

Pipe diameter affects flow rate and efficiency. Undersized pipes can clog or overflow, while oversized pipes can be difficult to join and support.

Quick sizing guide:

• Stormwater: Typically 90–150mm for residential drains.

• Wastewater: 40–100mm depending on fixture connections.

• Outdoor drainage: Match to the pit, grate, or connection point.

PlumbersHQ tip: Keep a selection of sizes in your kit — it saves trips to the supplier and ensures you can adapt on-site.

3. Matching Connections & Fittings

Using the correct fittings ensures joints are secure and compliant. Common types include:

• Couplings: Connect two pipe sections; choose the right material and diameter.

• Elbows & Tees: Allow directional changes and branching.

• Adapters: Bridge different pipe materials or sizes.

• Clamps & Seals: Provide extra security on push-fit connections.

Pro tip: Double-check connection compatibility — mismatched joints are a common cause of leaks.

4. Plan the Fall & Layout

Proper drainage slope (fall) is critical. Even the best pipes and connections can fail if the system isn’t installed at the correct gradient.

Tips for smooth installs:

• Aim for a minimum 1–2% fall for horizontal drainage pipes.

• Avoid sharp bends or unnecessary changes in direction.

• Check for obstacles that require elbows or custom fittings.

Planning ahead reduces improvisation and ensures a leak-free, efficient system.

5. Keep Essentials Stocked

A well-stocked kit saves time and prevents delays. Include:

• PVC, ABS, and HDPE pipes in common diameters

• Couplings, elbows, tees, and adapters

• Seals, clamps, and fasteners

• Grates, pits, and access points

PlumbersHQ tip: Orders over $200 qualify for free delivery Australia-wide, so bundling essentials is both convenient and cost-effective.

Final Thoughts

Selecting the right drainage pipes and connections is one of the most important steps in any install. With the correct materials, fittings, and careful planning, you’ll prevent leaks, smells, and callbacks — saving time, money, and frustration.

CTA: Shop Drainage Essentials

Why PlumbersHQ: Free delivery on orders over $200 • Dispatch within 48 hours • Australia-wide delivery

Need help choosing the right parts? Reply to this email or contact us — we’ll guide you.