Originally Posted by Jeebas
So that fitting would go before the valve? Cooler wall > this thermometer thing > ball valve (and obvously any fittings in between)?
I think you could use it before the valve or after the valve depending on your purpose. I think the only fitting you would need is an additional nipple. I recirculate with a pump and I use a PID for temp control in my beverage cooler. I'm thinking about putting one between the cooler and the valve. The valve would be pointing downward or sideways. If pointed down, it would help with gravity flow systems.