The national alert Level 4 comes into force tomorrow, meaning only essential services such as service stations will remain open.
However, as the service station had employees who were immune compromised, she and her partner installed the pay hatch in the hope of reducing risk of virus transmission.
"We have to be quite careful — it would only take one person for us to have to close."
It would be operational from today, and as not all items could fit through the hatch, customers would still be served through the door if needed, she said.
"We’re just doing our best like everyone else in the community."
The hatch was not a new build, but was made for when her son was home from university a few years ago to allow him to work at the service station at night.
"I looked at it the other day and thought, ‘This could be a real godsend at the moment’."