Run a Vent Line
Note: In North America, it is a requirement to run a vent line from the macerator to the outdoors. This will help prevent what's called 'air lock' and will keep the pump running smoothly for a very long time. There may be an existing vent in the house to tap into, or a local vent that goes up through the walls and outside through the roof may need to be run.
Start by blocking off the breather opening in the macerating unit with the two supplied caps.
Use a reciprocating saw to cut the lid off the dome then slide the supplied accordion connector over the lip. Clamp it down securely.
Install a 1" and 1/2" street 90 into the connector. Mark where the 90 intersects with the wall, and remove the 90.
Use a hole saw to cut through the wall. Put the street 90 back in and secure it with a clamp.
Now, continue to run 1-1/2" PVC to connect into the tap made earlier. Use PVC hangers to secure the line.