When you receive a new machine the breather plug has a screw. This is to prevent oil from leaking out during Transport. 10338 is the seal (0-ring) that closes the plug entirely.
watch this video how to remove the plug on a new machine.
The 10116 breather plug is a small but crucial component for your Fischbein Empress sewing machine. It’s a specialized plug that allows air to enter the machine while preventing dust and other contaminants from getting in. This airflow helps regulate pressure within the machine and prevents overheating, which can lead to malfunctions and breakdowns.