If at any point you think to change your oil on your Krānzle pressure washer, it is a good practice to remove this cap and clean it out. Further inspection may require replacement if the o-ring has degraded, or clouding may have occurred in the plastic making it difficult to monitor oil level and quality.
Cheap insurance for your machine is keeping an eye on things, and it's always good to have a spare.
These are Krānzle factory units from the source.
Collections: Krānzle, Krānzle HD 1622TS, Krānzle k1122