304 Stainless Steel Compression Tube Fitting, Union, 3/8″ OD X 3/8″ OD (2 Pcs)
Only be used for connecting hard tube, such as steel tube, copper tube, etc. Otherwise, it may cause leakage. “OD” is the size of the tube you will connect, not the size of the female compression. Union for connecting and disconnecting two pipes more easily than couplings.