The Cessna 188 is a family of light agricultural aircraft produced between 1966 and 1983 by the Cessna Aircraft Company.

The initial design of the Cessna 188 was so successful that over its 17-year production run the basic airframe remained unchanged. Only the engines and the agricultural products dispensing systems were upgraded, other than some minor changes to the ventilation systems.
The main use for the Cessna 188 series was for agricultural purposes, but many examples were later acquired for use as glider and sailplane tugs (wikipedia).

Unique X-Plane design

• Distinctive look for the C188B
• Unique x-plane feature: Agricultural spray
• Challenging scenarios possible: Fully loaded

Features:

• Mouse wheel support
• DDS textures for faster load times and optimization.
• Chemical fumigation liquid effect.Chemical fumigation liquid effect.
• Chemical loader interface.
• Dynamic weight.
• Real weight reduction as you drop chemical liquid.
• Professional flight dynamics.
• Custom 3D sounds.
• High quality 3D model, textures and sounds.
• Blank texture for creating your own designs.

More pictures here