Steel Adapter, 3/4-14 Female NPT Cross

Function-wise, it’s a rigid cross fitting that gives you four female pipe-thread ports. The size called out for this one is 3/4-14 female NPT, and it’s an Eaton Aeroquip cross (catalog C1BA27).

A cross fitting like this one connects four lines at a single junction point, all sharing the same port size. With 3/4-14 female NPT threads on all four ports, it lets you branch a hydraulic line in multiple directions without stacking a bunch of separate fittings together. It's a rigid configuration, meaning there's no swivel or articulation, so the connected lines stay fixed in position once everything's torqued down. Common use is in systems where flow needs to be split or distributed from one central point.