The KQ2U23-04A part of SMC is a quick-connect, push-in fitting that is used to connect tubes and hoses without the need for soldering, welding, or gluing. It is designed to provide an easy and reliable way to create airtight, leak-proof connections between components. The KQ2U23-04A has an encapsulated seal ring and a 360-degree swivel union, so it can be used in any position while maintaining the tight seal. It is made of a corrosion-resistant nickel-plated brass, and has a 1/4-inch tube size. This fitting is suitable for a variety of applications, including air systems, vacuum systems, and fuel lines.