I fixed my flash flood finally after all these months. I used some pvc and some aluminum from a pop can along with alot of epoxy to seal the pump chamber back up. I also did a few mods:
Nozzle Drill: estimated 3 times. Not a clean drill but is powerful.
Max Range: 12 meters
Added rubber band
Same range, More Output.
PC Expansion (Cheap Tennis Ball tube)
Medium Colossus (5 layers, tubes were't that tight.
Wooden Pump with hockey tape under duck tape grip
(Hard to pump, 40 pumps until full)
Rope Strap for carrying as a side arm
Added Aqua Pack not really a mod
Hockey Tape Grip
Overall the gun is powerfull but its difficulty to pump hurts its battle effectiveness. In my last war I got two kills with the flood nozzle. My foes were DRENCHED!
The main nozzle is really good now and its more practical than the flood nozzle. The power and capacity have gone way up. The Tennis ball tube makes a good stock and is a cheap solution. It is also clear so you can see how many more pumps you need. When I pump it It expands to half the tube length.