28mm Waste / Smell Trap

28mm Waste / Smell Trap – Water Seal for Caravan Drainage

A smell trap (also known as a P-trap or water seal trap) is a plumbing fitting that maintains a water seal in your caravan's waste line, preventing sewer gases and odours from entering the living space through the drain.

This 28mm version is designed for the convolute pipe sizes commonly used in NZ and Australian caravan self-containment plumbing.

Key Features

• Prevents Odours Water seal blocks sewer gas from entering via the waste drain

• 28mm Fitting Correct size for standard NZ caravan self-containment plumbing

• Essential for Self-Containment Required as part of a compliant self-contained waste system

Easy to Fit Connects to standard 28mm convolute or rigid waste pipe

Type: P-trap / water seal smell trap

Pipe Size: 28mm

Material: Plastic

Application: Caravan self-containment waste plumbing

What is a waste smell trap used for?

A waste smell trap (or P-trap) is used to hold a small amount of water in the pipe, creating a seal that prevents sewer gases and odours from entering the caravan through the drain.

Why is it important for caravans?

It is essential for maintaining a hygienic living space and is a required component in most self-containment systems to stop grey water smells from coming back up the pipes.

What size pipes does this fit?

This smell trap is designed for standard 28mm caravan waste pipe systems, compatible with both rigid pipe and flexible convoluted hose.

How does a smell trap work?

It works by retaining water in a curved section of pipe, which acts as a barrier to block gases while still allowing wastewater to flow through normally.

Can it be used in a self-containment setup?

Yes, smell traps are a key requirement for compliant self-containment plumbing systems in caravans and motorhomes.

Is it easy to install?

Yes, it is typically installed inline with your waste pipe system and can connect via push-fit or hose connections depending on your setup.

Does it require maintenance?

Occasionally, yes. Some models include a removable cap so you can clean out debris and keep the system flowing properly.

Can I use one trap for multiple outlets?

In some setups, a single trap can be used after multiple waste lines join, but many systems use individual traps for sinks, showers, and basins.

Will it stop all smells?

It will stop most odours caused by grey water tanks, as long as the trap maintains its water seal and the system is installed correctly.

Where should it be installed?

It is usually installed below sinks, showers, or basins, or inline in the waste pipe before the grey water tank to ensure proper odour control.