The straight 3/8″ push-fit connector with a 1/4″ male thread connects 3/8″ tubing to a fitting or supply with a 1/4″ female thread, in a straight line. It is used to transition from the larger 3/8″ tubing line to a standard 1/4″ threaded connection, as found in some water filtration and reverse osmosis systems where different tube sizes are used.

One end...