M20*1.5 Female Thread X 1/2" Bsp Male Thread Connection Brass Pipe Fitting Adapter Coupler Connector - Pipe Fittings - AliExpress
Adapter M14 x 1.5 Internal Thread - M20 x 1.5 External Thread
uxcell Reducing Pipe Fitting Adapter 1/2 NPT Male x M20x1.5 Female, Stainless Steel for Water Oil Air Pressure Gauge - - Amazon.com
Amazon.com: uxcell Pipe Fitting Reducer Adapter M20X1.5 Male to 1/2 G Female, Stainless Steel for Water Oil Air Pressure Gauge : Industrial & Scientific