Testing tool for gas pressure regulator, Itron SER 10 and Rombach SER 10 Adjustment tool with thread M48 x 1.5 Test tool for the safety shut-off valve (SSV) of a gas pressure regulator (GDR), for example of the type Itron SER 10 or Rombach SER 10. 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.