what is the service life of KE bellhsg coolers?
 

i was wondering what the average safe service life is for a KE bellhouse dual cooler setup. the plates look like stainless but the connecting tubes look copper in color. i dont want to take a chance on running saltwater thru my motors or transmissions. what usually wears out from corrosion first the bellhousing in the cooler pockets or the coolers elements themselves. thanks in advance for any input. ratman