1. Introduction
Thank you for choosing the Duramax Cedargrain Durabox 416L Outdoor Storage Box. This versatile and durable storage solution is designed to protect your outdoor items from the elements while complementing your garden or patio decor. With a generous 416-liter capacity, it is ideal for storing cushions, garden tools, toys, and other outdoor essentials. This manual provides essential information for safe assembly, operation, and maintenance of your storage box.
2. Safety Information
- Read all instructions carefully before assembly and use.
- Keep children and pets away from the assembly area. Small parts can be a choking hazard.
- Do not allow children to play inside or climb on the storage box.
- Ensure the storage box is placed on a flat, level, and stable surface to prevent tipping.
- Do not store flammable or corrosive materials inside the box.
- The maximum recommended load capacity for the lid as a seat is 220 kg (485 lbs). Do not exceed this weight.
- Always close the lid securely to protect contents from weather and to prevent accidental injury.
- Exercise caution when opening and closing the lid, especially with the hydraulic cylinders. Keep hands clear of pinch points.
3. Package Contents
Please verify that all parts are present before beginning assembly. If any parts are missing or damaged, contact customer support.
- Front Panel (x1)
- Back Panel (x1)
- Side Panels (x2)
- Base Panel (x1)
- Lid (x1)
- Hydraulic Cylinders (x2)
- Hardware Pack (screws, pins, etc.)
- Instruction Manual (this document)
4. Assembly Instructions
Assembly is designed to be straightforward. Follow these steps carefully. It is recommended to have a second person assist with assembly.
4.1. Visual Assembly Guide
Watch this video for a visual demonstration of the assembly process:
Video: Step-by-step assembly of a similar outdoor storage box, demonstrating panel connection and lid attachment.
Video: Assembly process for a garden storage box, highlighting the interlocking system and final setup.
4.2. Step-by-Step Written Instructions
- Prepare the Area: Clear a flat, level surface for assembly. Unpack all components and ensure they are clean and free of debris.
- Assemble Side Panels: Connect the front and back panels to the side panels by aligning the interlocking tabs and pressing firmly until they click into place. Ensure the panels are oriented correctly with the woodgrain texture facing outwards.
- Attach the Base: Once the four walls are connected, carefully place the assembled walls onto the base panel. Align the tabs on the bottom edges of the walls with the slots on the base and press down firmly to secure.
- Install Hydraulic Cylinders: Attach the hydraulic cylinders to the designated points on the inside of the side panels and the lid. Follow the specific instructions provided in the hardware pack for correct orientation and secure fastening. These cylinders assist in opening and closing the lid smoothly.
- Attach the Lid: Carefully align the lid with the hinges on the back panel. Secure the lid using the provided pins or screws, ensuring it opens and closes freely.

Image: Front view of the assembled Duramax Cedargrain Durabox 416L outdoor storage box in dark grey.

Image: Side view of the Duramax Cedargrain Durabox 416L outdoor storage box, highlighting the integrated handles for easy repositioning.

Image: Technical diagram illustrating the overall dimensions of the Duramax Cedargrain Durabox 416L: 130 cm (Length) x 70 cm (Width) x 63 cm (Height).
5. Operating Instructions
5.1. Opening and Closing the Lid
- To open, gently lift the front edge of the lid. The hydraulic cylinders will assist in smoothly raising and holding the lid open.
- To close, gently pull the lid downwards. The hydraulic cylinders will provide a controlled descent, preventing sudden drops. Ensure the lid is fully closed to maintain weather resistance.

Image: The storage box with its lid fully open, showcasing the ample interior space for various items like cushions.

Image: A close-up view of the hydraulic cylinder mechanism, which ensures smooth and controlled opening and closing of the lid.
5.2. Locking Mechanism
The storage box features a built-in latch for a padlock (padlock not included). To secure your items:
- Close the lid completely.
- Insert a padlock through the designated hole on the front of the lid.
- Lock the padlock to secure the contents.

Image: Detail of the integrated locking point on the lid, designed to accommodate a standard padlock for added security.
6. Maintenance
To ensure the longevity and appearance of your Duramax Cedargrain Durabox, follow these maintenance guidelines:
- Cleaning: Clean the storage box regularly with a mild soap solution and a soft cloth or sponge. Rinse thoroughly with water and allow to air dry. Avoid abrasive cleaners or harsh chemicals, as these can damage the plastic.
- Weather Protection: The box is designed to be weather-resistant. However, during extreme weather conditions (heavy snow, strong winds), it is advisable to ensure the lid is securely closed and, if possible, place it in a sheltered area.
- Winter Storage: While the material is UV-blocking and weather-resistant, storing the box in a garage or shed during prolonged winter periods can further extend its lifespan. Ensure the box is empty and clean before storage.
- Hinge and Hydraulic Cylinder Check: Periodically check the hinges and hydraulic cylinders for any signs of wear or damage. Lubricate moving parts if necessary with a silicone-based spray.
7. Troubleshooting
- Lid does not close properly: Check for any obstructions inside the box or along the edges of the lid. Ensure the box is on a level surface. Verify that the hydraulic cylinders are correctly installed and not damaged.
- Water inside the box: Ensure the lid is fully closed and latched. Check for any cracks or damage to the panels. Verify that the box is not placed in an area where water can pool around its base.
- Box feels unstable: Confirm that all panels are securely interlocked and the base is firmly attached. Ensure the box is placed on a completely flat and stable surface.
- Difficulty moving the box: The box features integrated side handles. If the box is full and heavy, empty some contents before attempting to move it.
8. Specifications
| Brand | Duramax |
| Model Number | 0638801866039 |
| Color | Dark Grey |
| Material | Plastic (Polypropylene) |
| Special Features | Locking Cover, No Foundation Needed, UV-Blocking, Waterproof, Hydraulic Piston |
| Product Dimensions (L x W x H) | 130 cm x 70 cm x 63 cm (51" x 27.5" x 24.6") |
| Capacity | 416 Litres (110 Gallons) |
| Item Weight | 13.95 Kilograms (30.75 lbs) |
| Recommended Max Load (Lid) | 220 Kilograms (485 lbs) |
| Water Resistance Level | Waterproof |
| Assembly Instructions | Simple assembly instructions included |
9. Warranty and Support
For warranty information or technical support, please refer to the product packaging or contact Duramax customer service directly. Keep your purchase receipt as proof of purchase.







