Filling caravan water tanks

I think this topic may have been covered previously, but I will let you know how I fixed my problem. It has always been a pain in the a..se to fill the water tanks. had to do it slowly to prevent water blowing back through the filling points. We have 2/ 90L tanks, both have a drain tap at the bottom. I simply joined both taps with black poly pipe and a "T" piece in the middle. Then another length of black poly pipe to the outside of the van with a plastic gate valve and "Click on" hose connection at the end

To fill both tanks, open both drain valves, click on the water hose, remove the caps of the normal water filling ports, turn on the tap, open the gate valve then sit back and wait till water starts to come out the normal water filling ports. At that stage both water tanks are 100% full and twice as quick.

I will try and take a photo of the set up and post it on the forum. Cheers