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Tera Deflators

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Another angle on airing down your tires uses products that screw onto your valve stem and continuously let air bleed out. The four air deflators from Tera Manufacturing screw together to form a handy key ring, then simply screw them on the valve stem and they depress your core to let the air out. You can check the pressure with the deflators on the stem, and then simply remove them once they reach the desired pressure, as they won't stop themselves.