DEF Systems

 

Standard and Premium ISO 22241 Compliant Systems
Available on any TransFueler

 

What Is Diesel Exhaust Fluid (DEF)?

Diesel Exhaust Fluid (DEF) is a non-hazardous solution made of 32.5% high-purity urea (AUS 32) and 67.5% deionized water. It’s a key component in all modern diesel vehicles and heavy equipment using Selective Catalytic Reduction (SCR) technology. When injected into the exhaust stream, DEF helps convert harmful nitrogen oxide (NOx) emissions into harmless water vapor and nitrogen gas.

DEF is not used in gasoline engines, aircraft, or small diesel engines.

DEF_IMG_9618

Usage & Efficiency
On average, DEF is consumed at a rate of 2–3% of diesel fuel usage—roughly a 50:1 ratio. However, some heavy-duty equipment may use it at higher rates. Despite its critical function, DEF is environmentally friendly, non-toxic, and not classified as hazardous by the U.S. Department of Transportation.

DEF & TransFueler Equipment
With the growing demand for DEF across new diesel platforms, TransFueler offers optional DEF systems integrated into our diesel fuel trailers to support on-site refueling needs.

Quality Matters
TransFueler uses only ISO 22241-compliant components to ensure DEF purity and system protection. DEF must be stored, handled, and transported using approved materials and equipment to prevent contamination, which can damage costly SCR systems.

Refer to ISO 22241 Part 3 for DEF handling, transport, and storage standards, and Part 4 for guidelines on refilling interface specifications.

Standard Features
  • All Parts and Components are DEF Compatible per ISO-22241-3
  • 35+ Gallon Poly Cylindrical Tank: Opaque tanks prevent UV degradation.
  • PIUSI 115VAC or 12VDC Pump
  • PIUSI 1" Poly Manual Nozzle
  • 12' Dispensing Hose
  • Nozzle Holster
  • Extends Trailer Deck at Least Three Feet
  • NOTE: 12VDC pump requires Plus or Premium Fueling Package or Dedicated Battery System
Premium DEF System
  • All Parts and Components are DEF Compatible per ISO-22241-3
  • 35+ Gallon Poly Cylindrical Tank: Opaque tanks prevent UV degradation.
  • Industry standard Micromatic RSV Coupler prevents contamination and crystallization, while simplifying refilling.
  • PIUSI 115VAC or 12VDC Pump
  • DEF-Rated 1 Micron Filtration
  • DEF-Rated Meter
  • PIUSI 1" Poly Automatic Nozzle
  • 12' Dispensing Hose
  • Nozzle Holster
  • Extends Trailer Deck at Least Three Feet
  • NOTE: 12VDC pump requires Plus or Premium Fueling Package or Dedicated Battery System
Additional Features & Options
  • Authorized PIUSI Distributor.  View all PIUSI DEF products.
  • Enclosures prevent direct sunlight exposure and insulate from temperature swings.
  • Heating elements for tanks and enclosures reduce freezing and crystallization when ambient temperatures reach below 30°F.
  • Reels / Hoses of various lengths
  • High Flow Pumps: Gas, Diesel, 115/230VAC, and Pneumatic Powered Pumps with High Capacity Filtration and Optional Magnetic Drive
  • DEF-Rated Reels
  • Automatic and Manual Nozzles for a Range of Flow Rates
  • Mis-Fill Prevention Nozzles and Devices per ISO 22241-4
  • Breakaways, Swivels & Shear Valves
  • PIUSI Fleet Management System controls and tracks dispensing
  • Custody Transfer Meters for Weights and Measures-Approved Resale
Bulk Trailers and and Transfer Skids: 20, 35, and 70 GPM Models
The Following Materials Should Never Be Used in the DEF Fluid Path

 

Walkaround video of the TFC-1188-UN-D w/ 100-gallon DEF
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