Diamond-U manufactures & distributes high-quality pneumatic fittings & auto fitting products all over the globe. We are a leading manufacturer in the automotive repair, tire, and pneumatics industry. From air compressor parts to water bibbs, we offer just about everything you need to function at your pneumatic or automotive company. Around since 1923, we have served our industries by providing innovative techniques as well as long-established knowledge to ensure that every single part manufactured meets our high standards. Browse our products or request a wholesale quote today!