The Petroleum Equipment Institute is a trade association whose members manufacture, distribute and service petroleum marketing and liquid handling equipment.

Founded in 1951, PEI represents more than 1,600 member companies in all 50 states and more than 80 countries. Members include manufacturers, sellers and installers of equipment used in service stations, terminals, bulk plants, fuel, oil and gasoline delivery, and similar petroleum marketing operations.

PEI is located in Tulsa, Oklahoma, and is a not-for-profit corporation. Office hours are 8:30 a.m. to 5 p.m. CST Monday through Friday.

PEI's mission is to be the leading authority and source of information for the fuel and fluid handling equipment industries.

PEI is committed to promoting the value of members' services and improving the business relationships and practices of its members.