Water Zapper is an toy weapon, which is part of Kenners The Real Ghostbusters Toy Line.
Front of Card Notes
Pump the barrel and soak the ghost!
Back of Card Instruction
Sprays up to 20 feet to clean up ghosts in your neighborhood!
Fill the toy only with water. Pump the barrel grip to "soak" everything in sight!
Description from Action Toy Guide (1989)
Clean up ghosts in your neighborhood. Pump the barrel and shoot streams of water to wash away ghosts.
Description from Action Toy Guide (1990)
Pump the barrel and shoot streams of water to wash away troublesome ghosts.
- Oddly enough not noted, but the barrel looks to be based on the Real Ghostbusters particle thrower.
- The ghost on the front and the ghost on the back are stock ghosts Big Mohawk Ghost and Big Spike Ghost.