I'm going to fit an onboard tank in my new van. I have no problems getting a suitable tank (CAK Tanks) but they only supply kits with manual valves. I would like the 12v solenoid ones which were fitted to my previous van. Can anyone suggest a source? There are a number on eBay but I'm not sure where to buy them from. One is a 2 way, the other is a 3 way.