Equivalents for the Wellman spark plug W421
Meet the Wellman W421 spark plug — reach 15.2–19.0 mm, heat range medium. Browse its 15 equivalents: compatible, interchangeable and replacement spark plugs across NGK, Bosch, Champion, Denso and many more.
Technical information Wellman W421 spark plug
- Resistor
- no
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15 equivalents compatible with the Wellman W421 spark plug
No equivalent for this brand selection.
What can replace a Wellman W421 spark plug?
The Wellman W421 is interchangeable with: Beru 0100226376, Etecno1 GX80, Standard W421, Beru GN020, FAI GGP70, Lucas LP063. These spark plugs share the same mounting (thread, seat) and heat range.
What are the specifications of the Wellman W421?
Reach 15.2–19.0 mm, Heat range Medium, Resistor no, Seat Flat (gasket)
Cross-references and specifications are provided for guidance only. The wrench size can vary by brand, and some data is inferred from the plug code or an equivalent reference. Always check the vehicle manufacturer's recommendation before buying and fitting.