Oh sorry this is my first time on a forum. Well I never really thought about that info yet. FLow rate, fitting size. I think the flow rate should be around 1.5 gallons per minute and by the fitting size if you mean thread size, that would be 1/2 inch. If there is any more info that is required for this I would like to know. It could be made out of anything, as long as it doesn't release toxins when heat is applied (heat as in 50 degrees c). It would be best if this it is a ball valve and the torque and other things like how much electricity or anything else that is needed can be anything. Sorry for the lack of detail though. Any info I missed can be anything that works. Thanks!