<html><head></head><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:12px"><div id="yui_3_16_0_1_1479949641924_2823">Alan,</div><div id="yui_3_16_0_1_1479949641924_2823" dir="ltr">I have figured out a way to use AGM batteries with oil compensation and NO need for 2psi relief valves. The rubber bladder on top can act as a pressure source. Just size the membrane to create tension by over filling with oil. Might work, but I am not sure what the benefit would be by using AGM's -they are actually heavier than lead acid.</div><div id="yui_3_16_0_1_1479949641924_2823" dir="ltr">Hank</div></div></body></html>