Auto waterers?

[JJtheJetPlane]

Could anyone recommend a good auto waterer for my stables, i have the basic galvanised ones at the moment and they havent been very sucessful over the last few yrs. I have found them to leak and for the ball cocks to become loose etc. I was hoping some of you guys could recommend a good one. Thanks in advance xx
please ignore my spelling without spell check im hopeless !!

 

[Dolcé]

we had plastic ones before we moved and they were useless - didn't refill or overfilled and leaked - but not sure what make they were. Have to be honest and say I would never bother with them again at least when you put a bucket in you know they will have water!