Mike-
I'm not sure what to suggest. The zinc size for each heat exchanger is different. The Oil Cooler zinc is larger than the zinc for the raw water heat exchanger. I've had no trouble finding the right size zinc at either location. You can buy the pencil zinc as a separate item, or you can buy then as a zinc/bronze threaded cap assembly. The zinc for the Oil Cooler is threaded into the top of the exchanger, The zinc for the raw water cooler is harder to get to. It's on the aft end of the exchanger, and is inserted from the bottom. As you remove that zinc, you also drain the raw water from the exchanger.
Jim
_________________ Jim Voelxen Odyssey #191 Home Port: Osterville, MA
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