The original Volvo part number for the check valve with the correct sized hose barbs was 680467, but Volvo updated it to a 1228272 and then updated it to 9485451.
As I said, you can use the check valve with the smaller hose barbs by tightening the hose clamps, but that can damage the hose.
FYI, we sell the check valves that are made by ATE with the correct sized hose barbs for $15.00 while Volvo sells the incorrect sized check valves for $31.00.
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Eric Hi Performance Automotive Service (formerly OVO or Old Volvos Only) Torrance, CA 90502 hiperformanceautoservice.com or oldvolvosonly.com
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