... and trading company of USH piston rod seal, piston rod u cup seal,hydraulic piston rod seal,UPI seal,ect ... for hydraulic seals can include internal (rod seal), external (piston seal), symmetrical or axial seal. With the internal (rod) ... radial cross section.Hydraulic Seals – Type Piston SealsRod SealsBoth Piston & Rod SealsDust SealsBuffer RingWear Ring Both Piston & Rod Seals Hydraulic Seals – ...