Anti-vent loop connection

An anti-vent loop connection is required when the toilet installation is below the waterline. This prevents water inflow into the interior.
The anti-vent loop connection is made of ABS and is available in two different sizes.

Code Description External Diameter
[] Anti-vent loop connection, 1.9cm, image
Anti-vent loop connection, 1.9cm, 1.9cm
[] Anti-vent loop connection, 3.8cm image
Anti-vent loop connection, 3.8cm 3.8cm