The Selective Catalytic Reduction (SCR) filter is a key component of the emissions system on Cummins QSB4.5 and 3.8 engines from 2018 to 2024. Working within the SCR framework, the SCR filter helps reduce nitrogen oxide (NOx) pollutants in the exhaust, contributing to cleaner emissions and supporting regulatory compliance. When the SCR filter becomes worn or restricted, emissions performance can drop and fault codes may appear. The Cummins QSB4.5, 3.8 SCR Filter OEM 5505819 from Tamerx Diesel Parts is engineered to meet original equipment specifications, offering a dependable replacement to help maintain efficient emissions control.
• Reduces harmful NOx emissions by enabling the SCR system to convert nitrogen oxides into harmless
nitrogen and water vapor, supporting cleaner exhaust output and environmental standards
• Engine-matched design for QSB4.5 & 3.8 engines (2018–2024) ensuring proper fitment, correct
installation, and seamless integration with the factory exhaust and SCR system
• Maintains steady exhaust flow by supporting consistent movement of exhaust gases through the SCR
system, helping downstream components function without added strain
• OEM-grade construction (5505819) providing dependable durability, consistent performance, and
compatibility with original SCR system hardware
• Ideal for highway and light-to-heavy duty applications where sustained emissions control and efficient
SCR operation are crucial for long-term engine reliability
Replacing a worn or failing SCR filter with the Cummins QSB4.5, 3.8 SCR Filter OEM 5505819 from Tamerx Diesel Parts helps restore proper emissions treatment and supports long-term exhaust system health. Investing in a quality, OEM-matched SCR filter ensures your engine maintains efficient emissions performance and continues operating reliably under varied driving conditions.







































