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
NPT 1/2 Female Thread to 1/2 Inch Male Thread Pipe Fitting Converter A — gotonovo