Piston ballast pixhawk

Team I´m new to the forum and have a question, can somebody point me to get a piston tank working with pixhawk ? I´m a little bit lost. Thanks in advance.

Do you have hardware in hand, what is it?

The pixhawk is capable of toggling an output ping at 3.3V, this could be connected to a relay or similar.

I´m just in architecting phase, so 3.3V will trigger for example OXID eShop 4 | Sub Components | purchase online Piston Tank XP 6V 540 ? sounds great !!