Proflow screw-in breathers are perfect for gearboxes or differentials. Made from steel with a floating crimped cap, these are oem based. Small enough to fit in the tightest of spaces.Can used on diff housing applications but also on any type of expansion tank that requires to be vented.Does not need to be washed out like the sintered bronze type

 

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Proflow Valve Cover Bolt in Breather Adaptor AN12 Female, Silver

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