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Speedfx Adapter Fittings Are Manufactured Using Lightweight 6061 Aluminum. All Adapter Fittings Are Compatible With Most Manufacturers Hose And Hose Ends And Feature A 37 Degree Sealing Surface Which Creates A Leak Proof Seal. Speedfx Adapters Are Anodized Which Creates A Corrosion Resistant Finish. Speedfx Adapter Fittings Are Made In U.S.A.