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The Viair Air Fittings Accessories BSP Adapters are constructed from 0.125” female BSP to 0.25” Male NPT. They are used for air locking differential plumbing. The use of thread locker is suggested and comes in two fittings per pack. These adapters are made with heavy-duty solid brass construction. This fitting accessory is made in the U.S.A. and backed by a One Year Limited Warranty.