Product Name: Carbon Steel Tubing Couplings
Type: Tubing Coupling
Standard: API 5CT
Material Grade: Grade J55, Carbon Steel
Product Specification Level: PSL 1
Size: 2-7/8 Inch
Surface Treatment: Anti-Rust Oil
Thread Type: EUE (External Upset End) Internal Thread
Application: It is widely applied for onshore oil wells, shallow gas wells and water injection well completion, serving to connect separate tubing segments into an intact downhole tubing string for oil & gas transmission

Source: https://www.landeepipefitting.com/carbon-steel-tubing-couplings-api-5ct-j55-psl-1-2-7-8-inch.html
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