RHA (oil, hydraulic) and RGRA (grease) models are used for the supply lines of viscous fluids as they use oil hose.

Since it is operated under high pressure, it prevents fluid from leaking by using 2-3 O-rings on the left and right to keep the rotating part airtight.

It is installed with a 1-wired (2-wired) hose depending on the fluid pressure, and the models other than the ones on the table are custom-ordered according to the capacity, working length, and fluid used.