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NGK 4233 
Substitutes
Substitutes Spark Plug
Trade numbers : BPR6EVX-11
Spanner Size: 20,8 mmSpark Plug: 1 - Earthed ElectrodeSpark Plug: Fixed SAE connectorSpark Plug: Interference Suppression 5 kOhmSpark Plug: Platinum Middle ElectrodeSpark Plug: with gasket seatSpark Position: 3,5mmThread Length: 19,0mmThread Size: M14 x 1,25
NGK 3903 Substitutes
Substitutes Spark Plug
Trade numbers : BPR6EIX-11
Replaced numbers : 4233, 2212
Replaced numbers : 4233, 2212
Spanner Size: 20,8 mmSpark Plug: 1 - Earthed ElectrodeSpark Plug: Fixed SAE connectorSpark Plug: Interference Suppression 5 kOhmSpark Plug: Iridium Middle ElectrodeSpark Plug: with gasket seatSpark Position: 3,0mmThread Length: 19,0mmThread Size: M14 x 1,25
NGK 2212 Substitutes
Substitutes Spark Plug
Trade numbers : BP6ES-13
Spanner Size: 20,8 mmSpark Plug: Fixed SAE connectorSpark Plug: Nickel Middle ElectrodeSpark Plug: no interference suppressionSpark Plug: with gasket seatSpark Position: 3,0mmThread Length: 19,0mmThread Size: M14 x 1,25