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Aftermarket parts may appear slightly different, including the packaging.

Cummins4BT / 6BTOther Parts

Cummins 3957921 Zinc Electrode Plug

Compatible With Ism, QSM, ISB, QSB, and ISB Engines

Genuine Cummins Part

OEM #: 3957921SKU: 3957921

Ships in 4-5 days

$72.00

Taxes and Shipping are calculated at checkout

Special Order Item - not eligible for return

The Cummins 3957921 zinc electrode plug can be used for the following engines:

  • ISM and QSM
  • ISB and QSB
SKU 3957921
OEM Number 3957921
Part Type Miscellaneous
OEM Brand CUMMINS

Warranty

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Genuine Cummins parts warranty

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  • Orders are processed the same or next business day
  • Expedited shipping options available at Checkout
  • If same-day shipping is critical, please call to confirm availability

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Call any of our friendly Parts Dept. Specialists with your engine serial number, and we can quickly verify whether this part is the correct part for your engine — no guesswork.

Phone: 888.687.0539

Don't know how to find your engine serial number? Go to our Engine Help Center for assistance.