DUOLINE® may be installed in threaded oilfield tubular goods with nearly any connection option. There are a few general "rules of thumb" regarding connection and connection protection devices for DUOLINE®.
API threaded connections generally employ the elastomeric DUOLINE® corrosion barrier ring (CBR) that has over 50 years of field history. The elastomeric ring manufactured from a high performance rubber compound ensures proper corrosion protection to the vulnerable connection area.
Premium connections employ a "T" shaped PTFE CBR with either the DL-Ring system, or the "FGL" variation to common premium threads.