Use for verification of oxygen gauges on conventional oil-based piston pressure gauges (PPMs). It can be used to protect precision friction pairs of GPM from dirt, abrasives and residues of working media in the gauge after operation.
Collapsible design with internal location of the separating element and possibility of its replacement. Provides 100% protection of the device or the GPM due to the presence of the separating element - rubber membrane.
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