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Remember, it's the little things in life that count. Don't let a $ .40 O-Ring ruin a $ 4000 vacation -- Nothing will stop a dive faster than a bad O-ring. This O-ring kit (20 of Most Common O-Rings) has replacement rings for most tank valves and high & low-pressure hoses. This kit contains O-Rings commonly used for tank valves, HP and LP air hoses.