Product Description
SO Step Oil Reservoirs, Sight Glass, Made in the USA by American Truckboxes ATB®.
This SO step oil reservoir toolbox is built for fleet operators and professional drivers who need integrated oil storage and a service step on semi trucks. It is an aluminum truck toolbox designed to deliver convenient oil access, durable footing and protected fluid containment for daily service work. Manufactured in Blanchard, North Dakota by American Truckboxes LLC, this aluminum Line product is Made in USA and offered in multiple widths for fleet fitment and custom orders. Built for heavy use, it balances serviceability with corrosion-resistant construction.
Key Features
- Corrosion resistance - Aluminum construction
- Visible fluid level - Sight glass and filler cap
- Simple servicing - Filler cap for easy top fill
- Oil control - Single baffle to manage fluid movement
- Secure footing - Laser cut strut pressed grip steps
- Smooth exterior - All Smooth Finish
- Multiple sizes - Widths available: 12W, 18W, 20W, 24W
- Package depth and height - 26H and 28D
Specifications
| Material | Aluminum |
| Dimensions | 26H, 28D, 12W / 18W / 20W / 24W |
| Finish | All Smooth Finish |
| Warranty | 60-month limited |
Made in the USA by American Truckboxes ATB®, with over 25 years manufacturing truck storage and service products. For custom sizing, fleet orders or questions visit truckbox.com or call (888) 996-0376.
Frequently Asked Questions
Where is this toolbox made?
Made in the USA in Blanchard, North Dakota by American Truckboxes LLC, with 25+ years of manufacturing.
What warranty comes with this toolbox?
60-month (5-year) limited warranty for standard boxes; 12-month limited warranty for custom or modified boxes and auxiliary fuel tanks. Applies to the original purchaser only and is non-transferable. For full details see truckbox.com or call (888) 996-0376.
Can I order a custom size?
Yes, custom sizes are available. Custom and modified boxes carry a 12-month warranty.
Will this step oil reservoir fit my semi truck?
The A-SO51S is offered in widths 12", 18", 20", and 24" with a 26" height and 28" depth, designed for semi truck installations in the SO - Step Oil Reservoirs category. Measure your mounting location against these dimensions to confirm fit, and contact American Truckboxes if you need a custom size.
Is this oil reservoir weather sealed?
The A-SO51S is an aluminum step oil reservoir designed for exterior truck use and features a smooth finish that sheds debris. It includes a filler cap and sight glass to minimize exposure, but you should verify seals on installation points for full weatherproofing.
What kind of lid and access does the A-SO51S have?
The A-SO51S includes a filler cap and a sight glass for fluid access and level viewing. Its design uses laser cut strut pressed grip steps for safe footing while accessing the reservoir.
What finish or color options are available for this oil reservoir?
This A-SO51S unit is aluminum with an all smooth finish and is not painted. If you require a painted or alternate finish, discuss options with American Truckboxes for custom work.
Need help choosing?
Tell us the truck. We will match the box, or build one.
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Shipping to Alaska, Hawaii or Canada is quoted by phone.