Testing tool for gas pressure regulator Elster MR50 Adjustment tool with thread M42 x 1.5 Test tool for the safety shut-off valve (SSV) of a gas pressure regulator (GDR), for example of the type Elster MR50. 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.