SKU: 61924197554

21756505 Genuine Mack DOC Diesel Oxidation Catalyst

$449.55 $499.50
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Description

21756505 Genuine Mack DOC Diesel Oxidation CatalystPart details DESCRIPTION DOC Diesel Oxidation Catalyst CONDITION Used BRAND Mack PART NUMBER 21756505 OTHER OEM PART NUMBERS THAT WILL WORK 207 065 0003, 207 065 0004, 2070650003, 2070650004, 21212405, 21212407, 43006029, 43006209, 82017, 82018, C0075 ID, C0075ID, C075 ID, C075ID, C097 ID, C097ID, R43006029, R43006209, 21756506 Function of this part The aftertreatment system treats exhaust gases after they leave the engine using components such as the

Part details

DESCRIPTION DOC Diesel Oxidation Catalyst
CONDITION Used
BRAND Mack
PART NUMBER 21756505
OTHER OEM PART NUMBERS THAT WILL WORK 207-065-0003, 207-065-0004, 2070650003, 2070650004, 21212405, 21212407, 43006029, 43006209, 82017, 82018, C0075-ID, C0075ID, C075-ID, C075ID, C097-ID, C097ID, R43006029, R43006209, 21756506

Function of this part

The aftertreatment system treats exhaust gases after they leave the engine using components such as the DOC, DPF, and SCR catalyst. It controls soot and NOx emissions by trapping particulates and converting harmful gases into less harmful compounds.

Why this part matters

These components are central to emissions compliance on modern diesel trucks. Problems in the aftertreatment system can cause frequent regens, power derates, and down-time until the fault is corrected.

About the brand

Mack is known for building tough trucks and components for construction, vocational, and highway fleets that need reliable performance day after day.

Fitment & usage

Used OEM parts are a smart choice for controlling repair costs while still using original-equipment components. Always match the OEM part number(s) listed to your existing part, and consult your service manual, dealer, or technician if you are unsure about fitment.

Note: Because this is a used component, normal signs of wear such as scratches, discoloration, or light surface corrosion may be present. Refer to the product photos and information on Second Truck Parts for the best representation of the part you will receive.

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 61924197554

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4.1 ★★★★★
Based on 10 reviews
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Product Reviews
S
Verified Purchase
Stephanie S.
West Palm Beach, US
★★★★★ 2
Gave it a Try
I have always used the Chuck It ball and ball launcher. I thought I would try this since the price was better. There is definitely a reason it is priced lower. The handle on this one twists on and constantly comes undone when you throw, and it does not launch nearly as well. I would not order this product again.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 26, 2026
E
Verified Purchase
Elijah
Chelsea, US
★★★★★ 4
A few usability issues
My dog is obsessed with playing fetch. It’s part of our daily routine. Pros - I like that this comes with two launchers so we can keep one at home and one in the car. - Build feels solid Cons - The cup is slightly too small for regular sized tennis balls. I buy the large Costco box of Penn tennis balls every couple of years for my dog. If you fully seat the ball in the cup/launching end, it’s extremely difficult to throw and puts some strain on your wrist. — the workaround is to only partially insert the ball when picking it up. - Like others have stated, the launcher does come unscrewed occasionally after a few throws. It’s kind of annoying so I’ll likely try some thread lock, but ideally that wouldn’t be necessary.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 15, 2026
P
Verified Purchase
Peter J Anderson
Lake Worth, US
★★★★★ 5
Fun!!!
I can’t say enough good things about this tennis ball launcher! Roxy absolutely loves it. Every time I pick it up, her tail goes crazy with excitement. It’s so easy on my arm, and I love that it gives her a great way to burn off energy. The launcher is sturdy, well-made, and works like a charm. If you have a high-energy pup like Roxy, this is a must-have!
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Reviewed in the United States on May 21, 2026
D
Verified Purchase
D. Rodriguez
Natrona Heights, US
★★★★★ 3
Fun along with frustration….
The product is good. The only problem is that the dark blue handle screws onto the lighter blue stick, and every 5-10 throws it comes unscrewed, and you have to screw them back tight. Maybe if they put a little bump in the handle and an indent on the handle so they could click into place it would work fine.
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Reviewed in the United States on May 27, 2026
J
Verified Purchase
Jody
San Leandro, US
★★★★★ 5
Great value. Durable
Durable! Dog loved it.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 23, 2021

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