Compatibility: Replaces S3240, R12T, 120AT, 18-7987, and RK10222. Flow rate: Designed for high-performance use with 15 GPH on the R12T model. It can be used for diesel. Filters are designed for high performance applications,and with flow rate of 15 GPH on the R12T model,your engine will perform better than ever with clean,water-free fuel.