6 8 10 12 15 16-28mm OD x M8-M30 1/8" 1/4" 3/8" 1/2" 3/4" 1" BSP Male Compression Union Brass Pipe Fitting Connector Coupler

6 8 10 12 15 16-28mm OD x M8-M30 1/8" 1/4" 3/8" 1/2" 3/4" 1" BSP Male Compression Union Brass Pipe Fitting Connector Coupler

Aliexpress UK