Dave:
Whether you have the pass thru or cap type sensors, they all have the potential to leak. Like you, I at first thought the pass through units looked larger and more cumbersome. But then I got to thinking about what you have to do to put air in the tires. Every time you put the sensors on, a little air comes out. I doesn't change the pressure all that much, but it bothered me that I wouldn't get an accurate setup. Also, the sensors all have some kind of locking device and that has to be dealt with every time you need to take them off / put them on.
I went with the pass thrus ... 'Nuff said.
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