Actually, I hoping nobody sees these caps because if they light up, I lost tire pressure.

As far as leakage, the valves used with Equal have a very fine screen or filter to stop any of that material from getting to the valve seat. So far I have had very little problems from that. I ran Equal in the last coach since around 1994, and maybe twice in that time I had to pull the valve and replace it. Out of 8 tires and hundreds of times checking pressure I thought that was not too bad.