A MPX-06-06 | 3/8" hose x 3/8" NPTF male pipe swivel is a type of hydraulic fitting that consists of two parts: a hose fitting with a 3/8" inside diameter and a male pipe swivel fitting with a 3/8" size and NPTF thread. The NPTF thread is a type of tapered thread commonly used in hydraulic and pneumatic systems to provide a leak-free connection. The male pipe swivel fitting has a tapered thread and a hexagonal shape, allowing it to be tightened with a wrench. The swivel design allows the fitting to rotate 360 degrees, providing flexibility in hose routing.