Thanks for the link! I may have to try some of those emitters.
Exploring the site led me to a gravity feed timer that might come in handy for the fruit trees that need roughly a gallon of water /month during the winter. Since we winterize the rest of the garden and put the Iro in standby, the Hubs built a passive solar water storage system. The problem was finding a timer that could deliver that amount of water during the winter.