Amazon.com: 10AN Flare to Metric 18 x 1.5mm Pipe Hose Adapter Fitting Aluminum Black Anodized AN10 Male Flare to M18-1.5 mm Male Metric Thread : Automotive
2pcs M18 x 1.5mm to M22 x 1.5mm Auto Car Straight Air Pipe Fitting Connector Adapter - Walmart.com
Pipe 1/4" NPT Female X M18 M18X1.5 Male Metric Adapter Fitting Oil Fuel | eBay
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M18 x 1.5 to 1/2" NPT Thread Adapter: Brass (ATEX)