Parker - Industrial Pipe Adapter: 1-1/16-12 x 3/4″ Male Thread, Male Straight Thread O-Ring x Male NPTF - 66458100 - MSC Industrial Supply
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
On-Stage MA-100 5/8 inch Female to 3/8 inch Male Microphone Thread Adapter | Sweetwater