RDEXP Blue Aluminum Alloy AN6-1/4"" NPT Male Flare to Male Straight Pipe Thread Fitting Adapter Set of 2 Union straight connector for disconnecting and connecting two inline pipes more easily than couplings Aluminum for corrosion resistance, high temperatures, and low magnetic permeability Anodized and Polished for bright appearance and anti-corrosion No leakage under temperature and high pressure