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NGK 4221 
Substitutes
Substitutes Spark Plug
Trade numbers : BR8ET
Spanner Size: 20,8 mmSpark Plug: 3 - Earthed ElectrodeSpark Plug: Fixed SAE connectorSpark Plug: Interference Suppression 5 kOhmSpark Plug: Nickel Middle ElectrodeSpark Plug: with gasket seatSpark Position: 2,6mmThread Length: 19,5mmThread Size: M14 x 1,25