Yeah sweet. I can get a deep meter square tray from the shop here! I'll check that out
Oh you got me now lol, do i need go hunting the valve out, fuck me it could be anywhere. But any shut off valve works ok in a big tray and tbh like i said it`s a mess about sticking down etc, one of these would work better added and screwed to side of your tray with bigger tubing added for faster filling and flow rate, you just gotta get the right height for it which is about 1/2 max i would say or so your pot bottoms are just sat in it maybe a few cm, easy enough to build cheap for a nice self fead hydro set up, you will also need to cover tray on top, so you don`t get any light leeks and that green algae shit growing, but its easy enough to do for pence, it`s only a shithouse system cut off valve and i would think any will will work, i not really planned or looked into it, but i have had a autovalve stuck down in a 4 pot tray b4, like said hardest bit is keeping the valve stick down which is why i think i standard shithouse valve drilled through side of a tray would work better. .