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XS Scuba Over Pressure Valve (OPV) Complete Assembly health_beauty_UK Pharmaceutical Grade Boric Acid DesignedXS Scuba Over Pressure Valve (OPV) Complete Assembly Need a spare over pressure valve (OPV) for your lift bag or BCD? XS Scuba's OPV comes in both 1" and 2" (2. 5 and 5. 1 cm) diameters. OPV is made from durable noncorrosive plastic with a durable corrosion resistant spring. Valve has a pull cord with plastic knob for easy use. If your lift bag or BCD is over inflating the valve will automatically compress the valve spring and relive pressure to avoid