This is the pump with connectors for the 18mm hoses.
![IMG_0120.JPG](https://lh4.googleusercontent.com/-mbbZHtBelws/Uvc9WI8X5vI/AAAAAAAAHSI/6Idd6dbHv6w/w800-h600-no/IMG_0120.JPG)
This is one of the hoses, I use this one to connect the tank to the pump. Because it's rippled it's a bit more modified than a normal 18mm garden hose.
It attaches to the bottom bit of the pump. I use another 18mm hose to attach to the top bit, and that hose goes from the pump out onto the lawn.
![IMG_0121.JPG](https://lh6.googleusercontent.com/-xEjTYPkN5ZM/Uvc9WQEEyBI/AAAAAAAAHSM/oOFD29zeWz4/w800-h600-no/IMG_0121.JPG)
I start with the big tank, which has a separate plumbed connector for attaching hoses. The main reason is so I don't have to prime the pump, gravity does this for me.
![IMG_0122.JPG](https://lh4.googleusercontent.com/-tFPvlB8fGFY/Uvc9XELLrDI/AAAAAAAAHSc/2Tn7oLAUHIw/w800-h600-no/IMG_0122.JPG)
Once I am finished draining the main tank, I use the valve on the hose to shut it off. I then disconnect it from the tank bit and attach it to the bit below, which just hangs over the tank wall of all the smaller tanks.
I open the valve again and the pump kicks in. The white valve you see below is redundant, I don't use that one at all. I just haven't taken it off the attachment ![:)](https://www.perthcichlid.com.au/forum/public/style_emoticons/default/smile.png)
I hope that makes it a bit clearer of how things work.
![IMG_0123.JPG](https://lh3.googleusercontent.com/-yF6MvYb2o_U/Uvc9XZCti2I/AAAAAAAAHSY/d1-6EqB7iN8/w800-h600-no/IMG_0123.JPG)