These quick connects come in handy for quickly connecting to and disconnecting from connections of all kinds! This is the female side that has a gray disconnect button for quickly disconnecting from the male end. It has a 3/8" straight barb to hook up to 3/8" ID tubing. It has a temperature tolerance range from -40 to 180F and a vacuum pressure tolerance of 120 PSI. This female piece is used with the Male 3/8" In-line Hose Barb, item #05P01-123.