In Stock - We sell filters locally that could affect stock – You will be contacted immediately if there are any availability issues
Features:
Proudly Made in America - No Core Required – Same fit and Performance as original equipment - New Not Reconditioned
OEM Cross Reference:
Cummins A055N991, 055N991
Warranty:
Skyline Emissions, Inc offers a 3-year, unlimited mileage warranty on all their DPFs and DOCs
Shipping:
Free Ground shipping within the continental USA. Other options, including overnight, are available at checkout. We ship from several warehouses located throughout the USA. Orders placed after 2:00pm Eastern time will ship next business day
California Orders - Returns – Cancellations:
Like ALL aftermarket DOCs, this item cannot be shipped to California. Please contact us if you are not sure this is the correct replacement, see our Shipping – Returns – Cancellations Policy in the top menu above
Have questions? Call an expert at 760-355-8900, 9am - 9pm EST
3-year unlimited mileage warranty Normally used for Cummins L9 Engines Model years 2017 to Present
Cross Reference: Cummins A055N991, 055N991
Like all aftermarket DOCs, this item cannot be shipped to California
American made Skyline aftermarket Cummins A055N991 DOC filter is your heavy-duty aftertreatment device that meets OEM specifications and is a direct replacement of original equipment. Skyline Emissions specializes in the design, development, and manufacture of a complete line of Cummins, Diesel oxidation catalyst Filters (DOC) and related emissions critical components. Developed by an engineering team with decades of diesel emissions control experience, Sky
line DOCs combine Exact-Fit™ design with exceptional quality and extensive performance testing. Skyline means greater value because our design, state-of-the-art manufacturing and testing capability have resulted in a durable DOC with extended service life. Skyline’s Cummins aftermarket A055N991 DOC is designed and manufactured in the USA and built to last and keep your fleet running with lower operating costs
Cummins A055N991 Inlet Module is a direct-fit OEM replacement designed to properly route exhaust gases into the aftertreatment system for optimal emissions performance. Built to Cummins specifications, this inlet module ensures reliable sealing, proper exhaust flow, and long-term durability in demanding heavy-duty applications. Ideal for restoring factory performance while maintaining EPA compliance and reducing downtime.
The price is for one A055N991 DOC Inlet Module; pictures are for reference only. Please contact us if you are not sure if this is the correct replacement.