19307141 Spark Plug, Rapidfire number is "4" and it covers ACDelco standard numbers: R43XLS, R44XLS, R45XLS, 42XLS, R45XLS6, R44XLS, 44XLS, and 41-618. Replaces 19238455

Why ACDelco RAPIDFIRE? Platinum

ACDelco RAPID Platinum Spark Plugs have been redesigned for improved performance your vehicle demands, for longer life and optimum efficiency. Features include:
?Ribless insulator that improves the seal ed center wire electrode with platinum pad
?Platinum tip provides improved durability
?Greater fuel economy
?Consistent starts in all weather conditions
?Smoother idle
?Available for most vehicle makes and models, including marine applications