You need to check the search feature of this forum 
There are so much post about this. You can check these for example:
If you have 6 to 8 valves you will need 6 to 8 relays if you want to use them independently.
You need to check the search feature of this forum
There are so much post about this. You can check these for example:
If you have 6 to 8 valves you will need 6 to 8 relays if you want to use them independently.