Rota-Flex Pin Box Replacement For Lippert 1621HD

Updated 03/25/2022 | Published 03/24/2022

Products Featured in This Question

Curt Air Ride 5th Wheel Pin Box - Lippert 1621 & 1621HD - 21,000 lbs

(88)

$1384.87

Trailair Rota-Flex 5th Wheel Pin Box - Lippert 1621 or 1621HD - 18,000 lbs

(86)

$721.27

Question:

Will this unit fit the lippert 1621 HD? LC328329

asked by: Ken

Expert Reply:

There is a Rota-Flex pin box that will replace your 1621HD pin box, but I checked with the manufacturer, and the part number you mentioned will not fit as a replacement. Instead, the correct Rota-Flex for your 1621HD is the following:

- Trailair Rota-Flex 5th Wheel Pin Box # LC328330

The # LC328330 does have an 18,000 lb capacity, so if you were looking for a replacement cushioned pin box with a 21,000 lb capacity like the one in your question, you'd need to go with a different option, the Trailair Air Ride 5th Wheel Pin Box # LC158778.

Either is going to be a big upgrade for a standard pin box, giving you a smoother, more controlled ride, with the difference being the Rota-Flex uses a rubber compound in its head to limit movement while the Air Ride uses an air spring and shock.

expert reply by: Kyle S