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316LL Stainless Steel M20-1.5 x 1/2" NPT and 1/2" x 1/4" NPT adaptor MACHINED HP | eBay
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Transmission Oil Cooler Line Connector - 1/2 x M20 x 1.5 - GM 2006-199 – AGS Company Automotive Solutions
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Amazon.com: M20 to 1/2" Inch NPT thread adapters. ( $8.44 Each - Sold in 10 Packs ) M20X1.5 threads on external side. 1/2" Inch NPT threads on internal side. Nickel plated brass
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