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
Metric Thread Female M20 M20x1.5 to Male M10 M10x1.0 Pipe Fitting Adapter Gauge | eBay
Amazon.com: Fitting Metric M20 M20x1.5 Female to 1/2” NPT Male Gauge Sensor Adapter : Automotive
AN Male to M20 x 1.5 Male Adapter From: - Speedflow USA
1/2 NPT Female x Metric M20*1.5 Male Pressure Gauge Adapter Stainless 304 | eBay
Amazon.com: Beduan Stainless Steel Thread Adapter M20 Female to NPT 1/2" Male Pipe Fitting Converter : Industrial & Scientific
20pcs M20x1.5 Male to 1/2"NPT Female Thread Adapter Coupler 316 Stainless Steel | eBay
M20 x 1.5 (male) to 1/2" NPT (male) Thread Adapter: 316 Stainless Steel