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Part # 18-2587
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Part # 18-2588
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Part # 18-2589
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Average Customer Review for Transmission Oil Cooler - 18-2587 - Sierra
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Sierra oil cooler
by William from Theodosia, Missouri on August 07, 2013
Product fit and performed perfectly. Comes unpainted but cost is reasonable. Very pleasantly satisfied
(2 of 2 people found this review helpful)
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On Sierra Marine 18-2589 - Transmission Oil Cooler, are the oil inlets and return fittings 3/8 NPT?
Sierra confirms it is 1" inlet and 3/8" NPT on the return fittings.

What is the difference between part number 18–2588 versus 18–2589?
18-2588 has a hose connection size of 1-1/4" and 18-2589 has a 1". 18-2588 also is 10" overall length, 18-2589 is 9".

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