Is Rod Stewart's Unplugged and seated concert available on DVD?
YES You can find it at http://www.bestcddvd.com/music/rod_stewart-336 I hope you enjoy your new DVD.
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The difference is "soft seated" or "metal seated". Soft seated valves are used in gas applications were any leakage is absolutely not tolerated. The materials used are Teflon or ceramic. Metal seated valves can have very tight shut-off, it all depends on the coating, pressure in the line, and the lapping of the surfaces.