Accutire MS-4350B Setpoint Tire Gauge

• Programmable to allow recording of factory-recommended tire pressure for both front and rear tires
• Reads 5-99 PSI in 0.5-pound unit increments
• Extra large, blue, backlit LCD screen for easy viewing
• Features ergonomic "easy grip" shape
• Comes with five-year manufacturer warranty

I agree with the other reviewers who said this product needs an o-ring. I found it very difficult to get it to seal on the tire valve stem, but with the o-ring it works perfectly. (Why they don't manufacture it that way I don't know). But by getting an inexpensive o-ring from Ace Hardware you have a product that is outstanding. Another reviewer said the size o-ring he bought was 1/4 x 1/8 x 1/16. However I found this size was too small and didn't fit. I had to get 5/16 x 3/16 x 1/16, and it's a perfect fit. And with tax it cost me a mere .18 cents. An easy modification well worth it.

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I bought an O-ring at Ace Hardware [stk no.35774B] and this ring fits perfectly into the inside of the sensor. Around the hole which makes contact with the metal tire stem. Walla ! the leak problem has stopped and one gets a very tight fit onto the stem curing the problem.

The exact size of the this rubber O-ring 1/4 x 1/8 x 1/16. [#60 O-ring]

at Ace Hardware. So one does not even need to cut or glue this thing to make it work. Give it a try! Cure the problem for sure. The part cost me

.74 cents.