At KUS, we’ve been manufacturing premium custom DEF tank assemblies for many years. As a leader in the industry, utilizing both rotomolding and blow molding techniques, we always manufacture our reservoirs to the highest standards. Now, we’re also offering off-the-shelf standard size DEF tank assemblies to give more customers access to our products.

The Importance of Proper DEF Storage

Diesel exhaust fluid (DEF), also known by the brand name AdBlue®, is an after-treatment fluid designed to break down harmful pollutants in diesel engine emissions. Although DEF is nontoxic, nonflammable, and generally considered safe to handle, it can cause corrosion on most metals. To avoid this corrosion, it is necessary to store DEF in a specialized tank on board a vehicle.

A DEF tank is a container built to ISO specifications for the purpose of storing DEF. Most commonly manufactured from high-density polyethylene, these containers also include DEF level senders (headers) to accurately relay fluid level information to the vehicle user in accordance with EPA requirements and to provide appropriate thawing capabilities in cold weather.

Reasons to Consider a Standard Size DEF Tank

A standard size DEF tank provides several advantages to customers requiring a DEF storage container. The most significant benefits include:

  • Reduced tooling time and cost between manufacturing and sale
  • Time and money savings on design and validation
  • Shorter lead times for customers

Upon reviewing a customer’s intended application, installation requirements, and product availability, we can quickly begin production and ship these products out quickly. This streamlined process also removes back and forth communication necessary with a custom build.

KUS Standard DEF Tank Specifications:

Primary Dimensions


(All tanks include at least 10% expansion space)

Size Orientation


L x W x D

Usable Total
18.9 L
(5 Gal)
Landscape 45.7 x 30.5 x 20.3 cm
(18” x 12” x 8”)
15.9L (4.20 Gal) 23L (6.08 Gal)
(5 Gal)
Portrait 30.5 x 45.7 x 20.3 cm
(12” x 18” x 8”)
18.2L (4.81 Gal) 23L (6.08 Gal)
(10 Gal)
Landscape 57.2 x 45.7 x 20.3 cm
(22.5” x 18” x 8”)
34.4L (9.09 Gal) 44.3L (11.70 Gal)
(10 Gal)
Portrait 45.7 x 57.2 x 20.3 cm
(18” x 22.5” x 8”)
35.5L (9.38 Gal) 44.3L (11.70 Gal)
(15 Gal)
Landscape 57.2 x 45.7 x 29.2 cm
(22.5” x 18” x 11.5”)
49.1L (12.97 Gal) 64.5L (17.04 Gal)
(15 Gal)
Portrait 45.7 x 57.2 x 29.2 cm
(18” x 22.5 x 11.5”)
52.1L (13.76 Gal)

64.5L (17.04 Gal)

Standard DEF Tank Features

KUS DEF tanks offer a variety of features designed to ensure the best performance in a wide range of applications. All standard DEF Tanks manufactured by KUS include:

  • Ultrasonic urea concentration and quality sensors
  • Reed-switch DEF level sensing
  • DEF temperature measurement
  • DEF coolant heating tubes
  • Durable HDPE construction
  • Tank ventilation
  • DEF filtration capabilities
  • Compliance with J1939 and OBD standards
  • Validation for on-road and off-road applications

Advantages of a Standardized DEF Tank From KUS

KUS DEF tanks offer several advantages over alternatives in the market. Our DEF tanks feature an in-house design, validation, and manufacturing process. With more than a decade of experience designing DEF tank solutions for the Americas, Europe, and Asia, we’ve refined our process to deliver superior components and designs for a variety of applications. Our products are well-regarded by many customers, and we’re proud to supply our DEF tank assemblies to various OEM manufacturers, as well as everyday customers.

At KUS, we also manufacture DEF level senders (headers) in house. This puts us in the unique position of being able to engineer, design, validate, and support both products concurrently, further expediting and unifying our production processes.

Explore KUS Custom DEF Tank Options

While our off-the-shelf standard tank options are more economical for a wide range of applications with fast, easy, and dependable solutions, we also understand that customization is often necessary. Common DEF tank customization options include:

  • Dimensions / Custom shapes and designs
  • Specialized signal systems / sensor profiles
  • Aesthetic changes or branding
  • Enhanced stress resistance
  • Specialized headers for unique thaw patterns
  • Different materials
  • Unique testing requirements
  • Different fitting sizes or orientations
  • Different header orientations

For more information on DEF tank customization options, contact our team.

Shop More Marine, Vehicle, and Industrial Solutions

We’re proud to offer a broad selection of products for marine, vehicle, and industrial applications. To see our full product offerings, shop our online store. You can also contact us by email or phone if you have any questions about our products. We look forward to serving you.