More than 500 hours of tests have been carried out with the DUOLINE internal lining coupled with DL-RING and Proprietary Premium Connections. The testing has been carried out at recognized reputable testing facilities in Houston, U.K. and France.
This testing coupled with field experience provide the industry the assurance of performance of the DUOLINE System + DL-RING in Premium Threaded Connections.
For more information on Duoline DL-Ring in Premium Connections:
www.duoline.com/web_size_img/PDF/DL-RingANDPremConn.pdf
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