ancestor Forced Father thread adapters internal to external Chronicle purity Margaret Mitchell
Adapter with external 1/4" NPT thread to external Luer Lock thread - Adapter System - Drifton A/S
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