About 10.45am, the man entered the service station on the Pacific Highway.

Police were told the man threatened a female attendant, demanding money.

He fled the scene a short time later with cash. 

No one was injured.

Officers attached to Tuggerah Lakes Local Area Command are appealing for information about the incident.

They are seeking a caucasian man, about 40 to 50 years old, 170cm tall, of medium build and with grey chin stubble.

He was wearing a white polo shirt, royal blue shorts, running shoes with pink laces, a dark brown beanie and dark sunglasses.

■ Crime Stoppers on 1800333000.