SOLAS 12 vein stainless YAMAHA 2021-later Gen 4, 4 Stroke Super Jet 144mm stator vein section. Greatly improves jet pump hook up, and efficiency. Includes 12 vein stainless pump, pump cone. **PLEASE NOTE** in the past we have had troubles with bearing clearance / fitment in the SOLAS pumps. Here at WATCON we personally check clearance each pump BEFORE it is put on the shelf for sale. All pump bearing areas are bored to our specs to reduce bearing press, and any bearing fitment issues. You can buy with confidence here.