Lippert Rota-Flex Pivoting Head Fifth Wheel Pin Box | 18K & 21K

Chucking is the fore-and-aft jolt you feel every time the truck and trailer disagree. Rota-Flex puts a proprietary rubber compound in compression inside a pivoting head so the king pin plate stays horizontal while the two vehicles pivot independently — absorbing the shock before it reaches the coach or your seat. Rust-inhibitive powder-coated lower jaw. Choose 18,000 or 21,000 lb.

Options

• 328330 — Rota-Flex pin box, 18,000 lb (109 lb)
• 328329 — Rota-Flex pin box, 21,000 lb (114 lb)

🚚 Freight item: ships by LTL freight due to size and weight. This item is not returnable.

⚠️ Match the Part Number. Select the exact part number for your unit — these are sold by part number and are not interchangeable.

⚠️ Air-ride alternative: Lippert Trailair pin boxes.

Key Features

• Pivoting head controls fore-to-aft king pin movement
• Rubberized torsion compound absorbs motion and road shock
• Improves ride while protecting the coach
• Rust-inhibitive powder-coated lower jaw
• Limited 1-year warranty

Specifications

• Brand: Lippert
• Ratings: 18,000 / 21,000 lb