Tru-Flates Valve Stem Adapter converts a large bore valve to a standard size tire valve. All brass construction. Female adapter uses threads on outer bore of large bore valve. Includes core. Tru-Flate is part of the Plews & Edelmann group. Plews Manufacturing and Sales Corporation was originally founded by R.G. Plews in 1927. At that time, the railroad industry was the primary focus for the companys extensive line of oil cans. As the transportation industry went from trains to passenger cars and trucks, Plews shifted their focus to developing the tools necessary to service this new mode of transportation. Fast forward 90 years and Plews has become part of Plews & Edelman. Today, Plews & Edelmann is a leading designer, manufacturer and distributor of a broad range of automotive parts and tools sold to the vast majority of mass merchant, retail auto parts stores and wholesale automotive parts and industrial distribution outlets, worldwide.