"Agreement." A contract or lease, or combination of both, or other terminology used to describe a contractual relationship between any or all of the following parties: a refiner, a distributor and a retail motor vehicle fuel station owner or operator.
"Distributor." A person who purchases motor vehicle fuel from a refiner for the purpose of resale to a retail motor vehicle fuel station.
"Refiner." A manufacturer of motor vehicle fuel.
"Retail motor vehicle fuel station." A place of business where motor vehicle fuel is sold and dispensed into the tanks of motor vehicles, either by means of a self-service or full-service pump.
75 Pa.C.S. § 4733