Testing tool for gas pressure regulator Itron 233 and Rombach 233 Adjustment tool with thread M60 x 2 Test tool for the safety shut-off valve (SSV) of a gas pressure regulator (GDR), for example of the type Itron 233 or Rombach 233. The test requires a controlled pressure increase in the downstream pipeline system in order to test the upper response pressure or shut-off point of the SSV. Material: aluminium An adjustment spindle is additionally required.