PAC (Pacific Asia Connection ) is a non preferred special connection for drill pipes with smaller diameter, shorter threads and a longer connection.
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/product/6-5-8-i-f-i...
Description. PMC/LONE STAR. 6 - 5 / 8 ″ ( I.F. ) Internal Flush Rotary Shouldered Conn. Work Plug Gauge. All work plug gauges are supplied with a handle.