I can confirm that this water valve device GR-105 does work with the latest stable Domoticz version 3.8153: http://s.aliexpress.com/EzmIRjqE . I did connected it to power, then
setup, settings, accept new hardware devices allow for 5 minutes
setup, hardware, zwavestick OpenZWave USB setup, include node
fast(!) triple click on the red button of the device
switches, learn light / switch
switch type On/Off, switch Icon: water
Maybe not all of these lines above are really needed, but this worked for me. After a reboot of Domoticz, all worked fine! Later this week I'll create a new movie how to water the garden plants with Amazon Alexa
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