Alphacool Eiszapfen 12mm G1/4" HardTube Knurled Compression Fitting - Sixpack - Deep Black (17375) ModMyMods.com - PC Watercooling Parts and Accessories
12mm Brass Closing Plug for Compression Ring Fittings 75 Bar DIN EN 1254-2 [2 Pieces] | Tameson.com
Amazon.com: Pysrych Stainless Steel 304 Compression Tube Fitting, Straight Adapter, 12mm Tube OD x 1/2" NPT Female Coupler, Pack of 2 : Industrial & Scientific