Testing tool for gas pressure regulators Itron 133 and Rombach 133 Adjustment tool with thread G 1 3/8 inch – 16UN Test tool for the safety shut-off valve (SSV) of a gas pressure regulator (GDR), for example of the type Itron 133 or Rombach 133. 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: aluminum An adjustment spindle is additionally required.