I use one of those Y pieces that have a turn off valve for either branch with a hose adaptor to connect to the hose and two pieces of clear plastic 19mm pushed onto the nipples that I feed down the two inlets.I must be doing something wrong, all I do is hook on the hose I have onto the tap with normal hose fitting and stick the plain hose end into the hole, when it gurgles a lot out of the breather its nearly full. I have a short hose just a bit longer than the van for filling tanks or hooking to tap on draw bar to wash sandy feet etc or doing the dunny.
Only get wet when missus doesn't turn hose off fully.
Can control the flow to either or both inlets while watching the tank gauge through the window.
Can also turn off both when full so no splashing and waste when going back to the tap to turn it off.
PS: feed my water through my filter to ensure clean water in the tanks.
