Make your own Tank sprayer with Amazon parts, list is Below
Pump: https://amzn.to/3I3wkyO
Switch: https://amzn.to/3joYmKF
Pouch: https://amzn.to/3Ibrz62
Batter Adaptor: https://amzn.to/3YS6PXd
Battery With charger: https://amzn.to/3jts4ym
Soldering Iron Kit: https://amzn.to/3Gb8IqA