[lbrachfe]

Steve,
They are the old fashioned vented caps and I installed a watering system that tells you when the level is low and you pump in distilled water with a hand bulb and 1/2" tube. Works great. I also use 2 Pulsetech Powerplus units on the house batteries to maintain the chemistry and avoid the need for Equalization... Battery life like this should be 5 years + if I get lucky.