Polished Rod Stuffing Box SU 4-73-31 Polished rod stuffing box is intended for sealing of the polished rod of the pump unit. The distinguished feature of this design is the usage of rubber seals with the advanced equipment life. Previous Post← Casing and casing accessories Casing and casing accessories Next PostPolished Rod Stuffing Box SUpk 2-73-31 → Polished Rod Stuffing Box SUpk 2-73-31