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Sherwood owners can now take advantage of a premium replacement impeller made with the patented MC 97 rubber compound. Leaders in global impeller technology, Johnson Pump replacement impellers are proven to be superior to the competition. Designed to provide maximum engine performance and adhere to strict tolerance manufacturing with exact OEM dimensions, the 7-Series has over 80,000 hours of continuous testing on Sherwood replacements alone.Impeller Replacement Kits, 17000K