LB Pipe & Coupling manufactures high-quality precision couplings for the oil country industry and American Petroleum Institut ... e (API)-certified markets. Our leading edge technology produces Premium and Semi Premium threads and API 5CT couplings for OCTG. We can also produce frac sleeves and other down hole tools. LB Pipe & Coupling Products located in Katy, Texas. Our plant is API and ISO 9001:2015 Certified. read more