avanti is on a metric system and depending on where you are you might not be on metric thats why they don't fit,, one has a fine thread the other is course, you will need ot go to an actual plumbing supply house, they have the converson fittings,, don't waste your time at home depot
Check and clean door sealing area
and door gasket.
•
Wipe any ice and excess moisture
from chamber.
•
Check and clean door sealing area
and door gasket
https://www.beckmancoulter.com/wsrportal/techdocs?docname=B10093.pdf