Leoben Scuba underwater octopus regulator keeper uses the high power magnets in this product .the strong magnetic holder keeps the two parts of the holder firmly together until the octopus is needed.holder can be attached to the BC with a carabiner 

Features:

·         Magnet holds octopus firmly in place.
·         When Required pull to Release.
·         Easy to deploy and re-stow.
·         No more foul ups during equipment removal.
·         Size: 56mm H x 26mm D

  the magnetic octopus holder is an aluminum octopus holder with
 a magnet fixing making it safer and easier to hold your octopus.
It's easy to attach to the right place and in case of an emergency
 onlyone pull is needed without the worry of it being tangled
or a too strong attachment.

- See more at: http://www.leobendivegear.com/Underwater-Scuba-ALuminum-Magnetic-Octopus-Holder-pd509443.html#sthash.9s68cSIh.dpuf