Vent Air Admittance Valve Tee McAlpine VP32T for 32mm Pipe Connections

McAlpine VP32T is an air admittance valve in a tee configuration engineered for 32 mm drainage pipe systems. The unit allows one-way air entry into sanitary drainage to equalize pressure, helping to prevent trap seal loss and maintain proper wastewater flow where traditional venting is limited. Designed for straightforward integration with 32 mm pipe outlets, the VP32T is intended for use in domestic and light commercial waste and soil pipe installations to reduce gurgling, improve discharge performance and limit odours.

Advantages

The tee-style air admittance valve provides reliable one-way air admission without the need for a roof or mechanical vent connection, simplifying retrofit and concealed installations. Its compact form and compatibility with 32 mm pipe connections make it suitable for tight spaces and under-sink applications. The valve design minimizes odour escape while allowing rapid pressure equalisation, contributing to consistent trap function and reduced risk of siphoning.

Suitable for

• Domestic sink, basin and appliance drainage with 32 mm waste connections
• Under-sink installations where roof or external venting is impractical
• Light commercial sanitary pipework with 32 mm branches
• Retrofit projects to improve discharge flow and prevent trap seal loss

Key specifications

• Connection size: compatible with 32 mm drainage pipe outlets
• Configuration: tee-style air admittance/vent valve for branch connection
• Function: one-way air admission to balance internal pipe pressure
• Application: suitable for waste and soil pipe systems in domestic and light commercial settings
• Design features: compact profile for installation in confined spaces

How to use

Install the VP32T into the branch of the drainage system at the designated 32 mm outlet position following local plumbing codes and manufacturer guidance. The unit should be oriented and secured to ensure airtight connection to the pipework; solvent weld, push-fit adaptor or the appropriate connector for 32 mm pipes should be used as required by the existing installation. Once fitted, the valve operates automatically to admit air when negative pressure occurs in the drainage line and to close when pressure normalises, requiring no user intervention during normal operation.

Usage recommendations

Use this air admittance valve only in installations where mechanical or roof venting is restricted and where local regulations permit unvented solutions. Ensure accessibility for inspection and replacement, and verify compatibility with the materials and fittings in the existing 32 mm drainage system. Routine checks during scheduled plumbing maintenance are advisable to confirm proper operation and to prevent blockages or debris from affecting the valve mechanism.