Gallon Bottle Pump - 1 oz. per pump

We love the KennelSol product and it works great as a disinfectant but the pump seems to always break? We have used it previously and didn't have this issue. The spring constantly pops out or the main part won't stay screwed to the actual gallon bucket. I wish we could figure out why this keeps happening because it's so expensive to keep ordering pumps.

I especially like how when I use it I know it is one ounce every time I pump it.