Product Overview This center swivel joint assembly, also known as a rotary manifold, is the hydraulic oil transfer component for excavators. It enables oil passage between the upper body and undercarriage while rotating, and is compatible with E336GC, E345GC, 320, 323, 330, and 335 models. The precision internal sealing structure ensures smooth oil delivery and stable performance, making it suitable for equipment overhaul and replacement. Interchange Part Numbers 490-3995,