Mamba Adapter Fitting Kit, M28x1.5 to 10AN, with O-ring, K027-0168 | eBay
Adapter HR20 Universal | VARIOUS M28x1,5 (Herz...)| 78323
Valve adapter M28x1.5 to M30x1.5 | MClimate
Valve adapter M28x1.5 to M30x1.5 | MClimate
Adaptall 9004-16-28 Series 9004 Carbon Steel Straight Adapter, 1"-11 Male BSPP x M28X1.5 Male Metric, BSPP x Metric, Carbon Steel: Amazon.com: Industrial & Scientific