COMP Cams Valve Seals 11/32in Stem

Marsoni

M251S

$61.13

Get it in 3 business days with 1 day shipping. Friday, May 29

COMP Cams Valve Seals 11/32in StemCOMP Cams offers a complete line of valve stem Seals, from the stock GM "O Ring" to the positive stop PTFE Seal. These Seals are a must to keep unwanted oil from entering the combustion chamber through the clearance in the valve guides. The "O Ring" Seals use the standard retainer and oil splash shield. The umbrella Seal is normally used when a larger than stock diameter spring is used, in the case of a double spring, the positive stop PTFE Seal is

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I haven't had a flat tire yet, so I also haven't had occasion to test these but they seem like great value for an extremely low price (especially versus a new tire.) I have handled them to try and gauge how quickly they'd smooth a hole, and they're rough / sharp and aggressive enough that I expect them to work quickly and well on not only tires, but on a variety of other materials. This pattern in particular should allow material to be shed and then passed backward pretty easily without clogging things up or slowing them down. If you've bothered to buy a patch kit for your tires, you really ought to have one of these around.

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Reviewed in the United States on January 18, 2026