Air Admittance Valve (AAV)

An air admittance valve (AAV) provides a reliable, one‑way air entry point for soil and waste drainage systems. It allows air to enter the system when negative pressure develops, preventing the siphoning of water from traps and helping maintain proper seal levels without the need for traditional vent pipework.

Manufactured from robust uPVC with internal sealing components, this valve is suitable for use in both domestic and commercial installations. Its compact design makes it ideal for use in cupboards, under sinks or in concealed areas where traditional venting to outside may be impractical.

Air Admittance Valve – Key Features & Benefits

• One‑way valve allows air into drainage systems
• Prevents trap seal loss and foul odour escape
• Durable uPVC construction for long term reliability
• Compact design for installation in tight spaces
• Easy to install on soil and waste pipework
• Suitable for use in domestic and commercial plumbing

Installer Benefits

• Reduces need for external vent pipes
• Quick and simple to fit with standard fittings
• Lightweight and easy to handle
• Helps maintain drainage system performance
• Ideal for retrofitting in existing systems

Applications

• Soil and waste drainage systems
• Under sinks and in cupboards
• Domestic bathrooms, kitchens and utility rooms
• Commercial plumbing installations

Performance & Durability

The air admittance valve is manufactured from high quality uPVC with a built‑in one‑way mechanism that allows air in while preventing foul odours from escaping the drainage system. Its design ensures reliable performance and helps maintain trap seals over time.

With no need for external venting, it is particularly useful in confined or concealed spaces where traditional ventilation is challenging or impractical.

Installation

The valve should be installed in the highest position of the internal drainage system where air can be drawn into the pipes. Ensure correct orientation and secure connection to the pipework using compatible fittings and seals. Follow manufacturer instructions to achieve optimal performance.

Product Specifications

• Material: uPVC body with internal sealing components
• Connection Size: Typically 32mm–110mm variants available
• Suitable for: Soil and waste drainage systems
• Installation Position: Internal vents above the highest fixture
• Application: Domestic and commercial plumbing