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Content: Screw the regulators into cylinder valve outlet using an appropriate spanner (Fig 2). 4. Fit flashback arrestors and hose to regulators (Fig. 3). 5. Adjust the oxygen regulator to allow a small flow through the hose then release the control. Repeat for the fuel gas regulator (this blows off dust and chalk from inside the hoses). ( Fig 4.) 6. Connect the handle to the hose end (Fig 5).