Here’s Fred's product review of the McAlpine Ventapipe 100 Internal/External Air Admittance Valve.

Ventapipe 100 Internal /External with dualfit synthetic rubber finger seal outlet for 4″/110mm pipe. The VP100E is an innovative valve suitable for internal and external use. It is easy to install as it has a simple pushfit connection. The product stops bad smells that can occur from negative pressures. This AAV is available in Black, Grey, and White.

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