Why are many shower hoses "explosion proof"?
I suspect you're seeing the result of poorly-translated product descriptions from China and elsewhere. For example:


  Advantages: Withdrawing life greatly improved. Should not damage the leaking. The inner tube using the nylon braided package EPDM more resistant wound. 


Honory99 1.5m Pull-type Copper Core Explosion-proof Shower Hose

This product would probably be called "burst-resistant" or something similar if described by a native English speaker.

ALL YOUR BASE ARE BELONG TO US!