Metal parts underwater are subjected to two basic types of corrosion: galvanic corrosion and stray current corrosion. Both can harm your boat, propeller, and motor if not correctly monitored and avoided.
According to Flags Unlimited, the significance of the flag's colors is this: The Blue represents the officer and the courage they find deep inside when faced with insurmountable odds. The Black background was designed as a constant reminder of our fallen brother and sister officers.
American Thin Blue Line Police Flag. We are the #1 Thin Blue Line Flag retailer in the world. In Stock and Ready to ship today!!! Thin Blue Line commemorates fallen law enforcement officers and to symbolize the relationship of law enforcement in the community as the protectors of civilians from criminal elements.