Crafted from strong strength brass with low permeability, this fitting ensures extended life, excellent heat resistance, and secure tube connection via integrated rubber gasket Essential for plumbers, mechanical engineers, and industrial maintenance professional working with pressurized fluid transfer systems or line installations The accuracy engineered 0.675 " internal thread diameter ensures seamless compatibility with standard tubing, while the double rotate mechanism enables flexible alignment during complex piping configurations for / equipment, refrigeration units, and pneumatic machinery requiring strong, rotation friendly brass fittings that withstand high temperature environments Premium 3 / 8 " brass union rotating connector features double rotate design with erosion resistant construction for leak proof reliability in and hydraulic systems, Manufacturer: Greabuy