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Lippert Components Inc.

21K FLEX-AIR PINBOX W/ LONG JAW

$2,330.10

SKU: L00E 369535

In Stock
In Stock
Ships by Jun 8
Free Shipping
Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Description

The CURT Flex Air 5th wheel pin box reduces chucking, bounce, and jarring during towing. It features an internal air bag, a built-in strut, and a rubberized pivoting head that work together to regulate movement of the king pin and absorb road shock. This combines Air Ride™ technology with a Rota-Flex™ pivoting head to minimize fore-to-aft movement and vertical tug-of-war, providing a smoother ride. An oil shock absorber handles rebound action and dampens kickback.

Fitment

Fitment Guaranteed

Don’t gamble
on fit.

Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

Available on iOS & Android

Specifications

BrandLippert Components Inc.
Part NumberL00E 369535

Videos

Installing a Flex Air Pin Box - Cougar Fifth Wheel Trailer

Installing a Flex Air Pin Box - Cougar Fifth Wheel Trailer
Flex Air Pin Box - The RV Doctor

Flex Air Pin Box - The RV Doctor
Lippert Air Ride Pin Box Review and Demo

Lippert Air Ride Pin Box Review and Demo
CURT Air Ride Pin Box - Watch Your 5th Wheel Float!

CURT Air Ride Pin Box - Watch Your 5th Wheel Float!
Ultimate REESE GOOSE BOX Video (Installation Process, Full Review, & Tips and Tricks)

Ultimate REESE GOOSE BOX Video (Installation Process, Full Review, & Tips and Tricks)
NO FIFTH WHEEL HITCH…TOW WITH THIS!

NO FIFTH WHEEL HITCH…TOW WITH THIS!
Lippert Axle & Chassis Identification

Lippert Axle & Chassis Identification
Lippert Components in Motion

Lippert Components in Motion
No RV Hitch Needed! #shorts #rvlife #rv

No RV Hitch Needed! #shorts #rvlife #rv

Buy with Confidence

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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