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Curt™

CURT M15 Flex Air® Pin Box - 18,000 lbs

SKU #: 328484

Get ready to experience a comfortable ride like no other! Our CURT® Flex Air® 5th wheel pin box is designed to regulate and reduce movement during towing, giving you a relaxed feel as you hit the road with your trailer or RV.

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  • expand-more Quick Facts
    • check Replaces Lippert 1621 5th wheel pin boxes
    • check Reduces chucking and absorbs road shock
    • check Medium jaw with pivoting head
    • check Features Air Ride™ technology
    • check Bolt-on installation with no assembly required
    • check Constructed with steel and a black powder coat finish that protects against rust
    • check 18,000-lb. towing capacity
    • check Made in the USA
  • expand-more Specifications
    • check SKU: 328484
    • check Brand: Curt™
    • check Series: Flex Air®
    • check Universal Part: No
    • check LCI Pin Box Number: M15
    • check OEM Pin Box Number: 1621
    • check Towing Capacity: 18,000 lbs.
    • check Pin Box Style: Medium Jaw
    • check Pin Box Bolt Pattern: 2-Row
    • check Pin Box Width: 12"
    • check Pin Box Features: Air Spring, Oil Shock, Pivoting Head, Torsion Compound
    • check Bolts Required Per Side: 6
    • check Country of Origin: USA
    • check Quantity In Package: 1
    • check UPC: 848150022356
    • check Warranty Term: 1 Year
    • check Unit of Measure: EA
    • check Reference Vendor/Manufacturer Name: Lippert
  • expand-more What's Included
    • check Pin Box
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Product description

Discover Comfortable Towing

Unwanted movement during towing can be a hassle. Stabilize your 5th wheel trailer or RV with the Flex Air® Pin Box by CURT®. The Flex Air features an internal air bag and built-in strut that both collaborate with a rubberized pivoting head to reduce chucking and virtually eliminate bounce and jarring. The pivoting head regulates movement of the king pin within the hitch while the rubber compound absorbs road shock, giving you a smooth ride that keeps things in control through the harshness of rugged roads

Engineered to Enhance

The Flex Air 5th wheel pin box combines our time-tested Air Ride™ technology with our Rota-Flex™ pivoting head to significantly reduce fore to aft movement and vertical tug-of-war between a 5th wheel RV and tow vehicle. It utilizes an internal air bag that moves in a scissor-like motion to absorb vibrations, a rubberized compound to soften jarring movement, and an oil shock absorber to handle rebound action, dampen kickback and control chucking. No need to worry when potholes arise or the road becomes uneven.

Packed with Strength and Simplicity

The Flex Air has a gross trailer weight of 18,000 lbs. and is designed to replace Lippert 1621 pin boxes. It uses the same bolts as the original pin box, so no additional hardware is needed to install it. Simply take it out of the box and hook it on to your trailer as it comes completely assembled and ready for installation. The Flex Air is constructed with high-strength steel and a black powder coat finish that protects against rust, giving you the power to tow steadily through all the adventures that lie ahead.

Features

  • IMPROVES RIDE – The Flex Air 5th wheel pin box combines our time-tested Air Ride technology with our Rota-Flex pivoting head to significantly reduce fore to aft movement and vertical tug-of-war between a 5th wheel RV and tow vehicle
  • INNOVATIVE STRUCTURE – This pin box contains an internal air bag that moves in a scissor-like motion to absorb vibrations, a rubberized compound to soften jarring movement, and an oil shock absorber to handle rebound action, dampen kickback and control chucking
  • SIMPLE INSTALLATION – The Flex Air is ready to be installed as soon as it comes out of the box. It uses the same bolts as the original pin box, so no additional hardware is needed for installation
  • BUILT TO LAST – Constructed with steel and a black powder coat finish that protects against rust, this pin box is extremely durable to ensure peaceful towing day after day
  • SPECIALLY DESIGNED – The Flex Air is specifically configured to replace Lippert 1621 5th wheel pin boxes with a towing capacity of 18,000 lbs.
Warning:

Warning Cancer and reproductive harm. www.P65Warnings.ca.gov

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Explore manuals, videos, FAQs and more associated with this product.

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Learn & Explore

  1. Introducing the CURT Helux™ 5th Wheel Pin Box
    Introducing the CURT Helux™ 5th Wheel Pin Box

    Introducing the CURT Helux™ 5th Wheel Pin Box

    The CURT Helux™ 5th wheel pin box combines advanced spring coil and shock technology to absorb jerking or bouncing movements, protecting the trailer, the truck, and the contents of both. 

    Read more arrow-right-alt
  2. How to eliminate chucking on a 5th wheel
    What Is 5th Wheel Trailer Chucking?

    What Is 5th-Wheel Trailer Chucking?

    Ever wondered what people mean when they say they're experienced 5th wheel chucking? More importantly, what can be done if you are experiencing chucking? Find answers and solutions here.

    Read more arrow-right-alt
  3. How to Choose the Best 5th Wheel Pin Box for Your Rig
    How to Choose the Best 5th Wheel Pin Box for Your Rig

    How to Choose the Best 5th Wheel Pin Box for Your Rig

    In this guide, we’ll walk through how to choose the best 5th wheel pin box for your 5th wheel trailer. Our goal is that you’ll come away from this guide feeling confident and ready to make an informed decision that fits your lifestyle, existing equipment, preferences, and budget.

    Read more arrow-right-alt
  4. Towing a fifth wheel vs travel trailer
    5th Wheel vs. Travel Trailer: Understanding the Difference

    5th Wheel vs. Travel Trailer: Understanding the Difference 

    In this blog, we will take a look at the differences between 5th wheels and travel trailers, two common categories of RV trailers. While neither type is necessarily better than the other, comparing their size, features, towing requirements, off-roading abilities and price can help determine which one is right for your adventures. 

    Read more arrow-right-alt

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  1. Introducing the CURT Helux™ 5th Wheel Pin Box
    Introducing the CURT Helux™ 5th Wheel Pin Box

    Introducing the CURT Helux™ 5th Wheel Pin Box

    The CURT Helux™ 5th wheel pin box combines advanced spring coil and shock technology to absorb jerking or bouncing movements, protecting the trailer, the truck, and the contents of both. 

    Read more arrow-right-alt
  2. How to eliminate chucking on a 5th wheel
    What Is 5th Wheel Trailer Chucking?

    What Is 5th-Wheel Trailer Chucking?

    Ever wondered what people mean when they say they're experienced 5th wheel chucking? More importantly, what can be done if you are experiencing chucking? Find answers and solutions here.

    Read more arrow-right-alt
  3. How to Choose the Best 5th Wheel Pin Box for Your Rig
    How to Choose the Best 5th Wheel Pin Box for Your Rig

    How to Choose the Best 5th Wheel Pin Box for Your Rig

    In this guide, we’ll walk through how to choose the best 5th wheel pin box for your 5th wheel trailer. Our goal is that you’ll come away from this guide feeling confident and ready to make an informed decision that fits your lifestyle, existing equipment, preferences, and budget.

    Read more arrow-right-alt
  4. Towing a fifth wheel vs travel trailer
    5th Wheel vs. Travel Trailer: Understanding the Difference

    5th Wheel vs. Travel Trailer: Understanding the Difference 

    In this blog, we will take a look at the differences between 5th wheels and travel trailers, two common categories of RV trailers. While neither type is necessarily better than the other, comparing their size, features, towing requirements, off-roading abilities and price can help determine which one is right for your adventures. 

    Read more arrow-right-alt
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