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This replacement high pressure O-ring is used on all the K-Pumps.
This is the small O-ring that is used on all K-Pumps. Outside diameter is 2 5/8".
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K-Pump High Volume O-Ring
C$5.50
This replacement high volume O-ring is used on the two-stage K-Pumps. This is the large O-ring that is used on the K-Pump 40 and 400. Outside diameter is 4".