Introduction
The Diono Angle Adjuster is designed to enhance the rear-facing experience for older children in Diono Radian and Rainier convertible car seats. This accessory elevates the car seat to a more upright position, providing additional space for front-seat passengers while maintaining a safe rear-facing orientation for the child. This manual provides detailed instructions for proper installation and use.
Setup and Installation
Compatibility
The Diono Angle Adjuster is compatible with the following Diono convertible car seats:
- Diono Radian series
- Diono Rainier series

Installation Steps
Follow these steps to properly install the Diono Angle Adjuster with your compatible car seat:
- Prepare the Car Seat: Ensure the car seat is placed in the rear-facing position in your vehicle. Leave the seat belt or LATCH strap loose for initial placement.
- Position the Angle Adjuster: Lift the car seat slightly and slide the Angle Adjuster underneath the base of the car seat. Position it so that it is touching the back of the car seat's detachable base.
- Tighten the Car Seat: While pushing down firmly on the front of the car seat, tighten the seat belt or SuperLATCH system through the rear-facing belt path until the car seat is securely installed.
- Check for Tight Fit: To confirm a secure installation, check for movement at the rear-facing belt path. The car seat should move less than 1 inch (2.5 cm) in any direction when checked with one hand. Do not check for movement at the top of the car seat.

Installation Video Guide
For a visual guide on installing the Diono Angle Adjuster, please refer to the video below:
Video: A representative demonstrates the installation of the Diono Angle Adjuster with a car seat in a vehicle. The video shows how to position the adjuster and secure the car seat for a tight fit.
Operating Instructions
Benefits of Use
The Diono Angle Adjuster provides several advantages when used with compatible rear-facing car seats:
- More Upright Angle: Creates a more upright seating angle for older children, which can improve comfort and visibility.
- Increased Front Seat Room: By adjusting the car seat's angle, it can free up to 4 inches (10 cm) of space in the front passenger seat, allowing for more comfortable seating.
- Extended Rear-Facing Use: Facilitates longer rear-facing use by optimizing the car seat's position within the vehicle.
- Firm Support: Made from high-density foam, it provides stable and firm support for the car seat.




Care and Maintenance
The Diono Angle Adjuster is made from high-density EVA foam. To clean, wipe with a damp cloth and mild soap. Allow to air dry completely before re-installation or storage. Do not submerge in water or use harsh chemicals.
Troubleshooting
Common Issues and Solutions
- Car seat not fitting properly: Ensure the Angle Adjuster is correctly positioned directly under the car seat's base and that the car seat is fully tightened according to the installation steps. Refer to the installation video if needed.
- Angle Adjuster sliding: A properly installed car seat with the Angle Adjuster should be secure. If sliding occurs, re-check the tightness of the car seat's installation at the belt path. The car seat should not move more than 1 inch (2.5 cm) in any direction.
- Unsuitable for certain vehicle seats: Some vehicle bucket seats may not provide a flat surface for optimal Angle Adjuster placement. Ensure the Angle Adjuster sits flat and stable before tightening the car seat.
Product Specifications
| Feature | Specification |
|---|---|
| Product Dimensions | 1.9 x 13 x 15.3 inches (5 x 33 x 38 cm) |
| Item Model Number | 60320 |
| Material Type | High Density EVA Foam |
| Item Weight | 6.4 ounces |
| Target Gender | Unisex |
| Maximum Weight Recommendation | 45 Pounds (for car seat, not adjuster itself) |
| Maximum Height Recommendation | 3 Inches (height added by adjuster) |


Important Safety Information
- The Diono Angle Adjuster is not appropriate for newborns or children without head control. It should only be used once your child has developed sufficient head control or can sit up unassisted.
- Always refer to your specific Diono car seat's instruction manual for complete safety guidelines and installation requirements.
- The Diono Angle Adjuster has been crash tested to ensure safety when used as directed.
Warranty and Support
For warranty information regarding your Diono Angle Adjuster, please refer to the warranty section of your Diono Radian or Rainier car seat instruction manual. For further assistance or support, please contact Diono customer service through their official website or the contact information provided in your car seat manual.







