N n7188u New Member May 25, 2010 #1 My 99 Challenger 1800 has two Solas SF-CD-15/23 impellers. Solas literature indicates that the impellers for this boat should be SD-CD-15/23. Does anyone know the difference between the SF and SD? Chris
My 99 Challenger 1800 has two Solas SF-CD-15/23 impellers. Solas literature indicates that the impellers for this boat should be SD-CD-15/23. Does anyone know the difference between the SF and SD? Chris
