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>>         As annoying however was the attitude at several dive shops I
>> encountered when attempting to purchase spare disks (I have since doubled
>> the disks on our tanks.)  For one, it is quite hard to purchase just the
>> disk as most shops try to sell a kit comprising the disk, spacer, and screw
>> for around $9.  In contrast, the disk by itself sells for around $2.50
>> /Matthias


The reason the plug is replaced with the disk is that the bottom inside edge
of the plug is sharp when it is new.  The sharp edge causes the disk to
rupture in near pure shear at a predictable pressure.  If you reuse plugs
this sharp edge becomes progressively rounded and the disks begin to rupture
in a combination of tension and shear which causes the rupture pressure to
increase.

Sorry to bust your conspiracy bubble  : )

Bill

PS  I agree that they are a hazardous as well as a  waste of time and money
in scuba tanks.

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