API 16C 2-1/2", 3", 3-1/2" and 4" Coflex flexible hoses Coflex flexible hoses are for drilling and service both onshore and offshore in applications as choke and kill lines. Choke and kill lines are essential to control the well control equipment. Coflex flexible hoses are specifically designed to handle the high pressures and flow rates this use requires. Working Pressure: 5,000 Psi, 7,5000Psi, 10,000Psi Temperature: -20Ë?Cï½?+121Ë?C Connection: Welding or integral forged unions, flanges, clamp connection type, or can be designed according to