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Both sides are for 8MM or about 5/16" lines.
Note: Other sizes and colors available in our other auctions.
Stops stubborn leak back problems that may cause hard starting. This valve is designed to put inline where rubber hoses are used. Be sure to install it so the fuel can go in the direction desired. I have seen many a hard starting problem cured with one of these items.
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The extra photo below shows the inside of these check valves, thanks for looking.
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