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Supplied with 6mm hose barbs and a mounting bracket. If you need to change the pressure to the carb, take off the cap nut, loosen the locking nut and turn (1\/4 of a turn at each time) the adjusting screw clockwise to increase the pressure or anticlockwise to decrease it, until you have the pressure you want. Lock first the nut and then the cap. Most carbs require about 2.5 psi. Please read the safety instructions about fitting that are included in the box.