Brass Sump Plug Adapter Male 1/2"x20UNF to M10x1.5 Female Thread for Sensor/Gauge. Thread Sizes: Converts 1/2"x20UNF male to M10x1.5 female thread. This high-qualitybrass sump plug adapter is designed to convert a1/2"x20UNF male thread to anM10x1.5 female thread, making it ideal for connecting sensors, gauges, or other fittings.
eBay