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Description
Idler Pulley 3971876 for Cummins 4B3.9 6C8.3 ISB/ISD4.5 CM2150 ISBE CM800 QSL9 CM850Replacement part number: 3971876 Application: Fit for Cummin Engine: 4B3. 9, 6C8. 3, ISB ISD4. 5 CM2150 B119, ISB ISD4. 5 CM2150 SN, ISB ISD6. 7 CM2150 SN, ISB4. 5 CM2150, ISBE CM800, ISBE4 CM850, ISC CM850, ISF2. 8 CM2220 F122, ISF3. 8 CM2220, ISL CM2150, ISL CM850, ISL9 CM2150 SN, NH NT 855, QSL9 CM850(CM2850)
Replacement part number:
3971876
Application:
Fit for Cummin Engine:
4B3.9, 6C8.3, ISB/ISD4.5 CM2150 B119, ISB/ISD4.5 CM2150 SN, ISB/ISD6.7 CM2150 SN, ISB4.5 CM2150, ISBE CM800, ISBE4 CM850, ISC CM850, ISF2.8 CM2220 F122, ISF3.8 CM2220, ISL CM2150, ISL CM850, ISL9 CM2150 SN, NH/NT 855, QSL9 CM850(CM2850)
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
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Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
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4.5 ★★★★★
Based on 7 reviews
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Product Reviews
★★★★★ 5
Pretty and sturdy little event cups
Size: 50PCS, Color: 14oz Gold Glitter
The perfect little cup for a wedding shower. Loved the look and color and print on these cups and they were an excellent size and thickness to provide durability and as not to leak. Would order these again for future events.
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Reviewed in the United States on February 13, 2026
★★★★★ 5
Great size, great thickness
Size: 50PCS, Color: 14oz Gold Glitter
Nice quality. Thick and sturdy material. Color gold adds a perfect sparkle.
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Reviewed in the United States on May 25, 2026
★★★★★ 5
10/10 recommend!
Size: 100PCS, Color: 9oz Gold Glitter, Size: 100PCS, Color: 9oz Gold Glitter
I used these cups for my son’s graduation party and used them as favor cups with a diy grad cap with tassel. They’re very pretty cups and sturdy! 10/10 recommend!
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Reviewed in the United States on May 15, 2026
★★★★★ 5
Great cups for any party
Size: 50PCS, Color: 14oz Gold Glitter
Great cups, so nice that some guests at shower were afraid to throw them away! 😂
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Reviewed in the United States on May 15, 2026
★★★★★ 4
Cute, perfect for party. A little flimsy.
Size: 50PCS, Color: 14oz Gold Glitter
Very cute and perfect for my daughter’s golden birthday celebration. The cups are a little thin and prone to break, but not a huge deal since they’re used at disposal cups anyways.
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Reviewed in the United States on June 26, 2025