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Hey mate - don't have a photo, but mine is a small, black cylindrical unit on the inlet pipe from the compressor unit. It has a wide chisel tip slot in it that you can use a screwdriver to adjust. What do you need to do? The lights/gauges on your LPG monitoring unit (under the bonnet also usually - on the firewall on the passengers side) should tell you whether it's running rich or lean and cycling back and forth between the two as you increase, maintain and decrease throttle.