The 6721 is a spark plug manufactured by BOSCH. Need a substitute? There are 9 compatible replacements, with popular options like the ACDELCO 12582002 and the BOSCH 8112.
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Specifications
Specifications are still being gathered for this part. Check back soon.
Looking for detailed specs? Try a cross-reference equivalent below — they may have more information.Looking for detailed specs? Check the cross-reference equivalents — they may have more information.