| When they started honing the inside like that is when they started being made by only having four or so smaller welds on the outside where the connecting end plates were attached then welded and honed on the inside. I remember some people thinking they had not bought SZ pipes from other people because of the smaller inside diameters like in the "other" picture. There were definitely different SZ DPs sold over the years. They continue to improve on their products.
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