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A gas trigatron type gap for a 36-channel ring switch of a five-cascade water-insulated double step forming line with output impedance of 2.9 Ohm “Gamma-1” high-current electron accelerator is described in this paper. At discharge operating voltage of 1 MV its overall dimensions are: height ~ 160 mm, diameter ~ 240 mm. When operated with a mixture of insulating gas and nitrogen in proportion 40%SF₆+60%N₂ at 17 MPa pressure, the trigger delay is (16 ± 2) ns, with a self-break safety margin of not less than 1.5. The gap electrode surfaces are made of tungsten alloy. When operating as a part of the double step forming line switch, the average energy, switched through a single gap, is 3.3 kJ, and the current is 95 kA.