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The Deflector Generator is a block added by Engineer's Toolbox. The Deflector Generator will generate Deflector blocks above it. By default, it will generate 3; however, placing more Deflector Generators underneath will increase the number of Deflector blocks by 1 per added Generator until the maximum number of 7 Deflectors.
The Deflector block acts like a ghost block in that it can be entered. When an entity enters a Deflector block, it will make a loud clicking sound. Although the official Engineer's Toolbox Manual notes this will cause damage, it in fact does not. Deflector blocks can attach to each other in a way similar to Iron Bars.
Giving a Redstone signal to any part of the Deflector Generator will disable it's functionality.