I have fond memories of classic first-generation SuperSoakers from my childhood, so I made one for a scene I am doing. The pump handle and trigger are rigged, and the empties parented to the two tanks will keep the waterlines level and can be used to adjust the water level.
This was built entirely from scratch. The only outside assets used were some reference pictures, and some scratch alphas. The latter are not included in this blend, just the baked final maps.
I'm releasing this as CC-0, but attribution is nice if you can manage it. If you use this I'd love to hear about it. Enjoy!