Made in USA. Pure Stealth U-Bend-Em Hard Lines are a handy, practical and attractive option for plumbing aftermarket A/C systems. #8 Male O-ring connection on one end and #8 Female O-ring connection on the other end. We suggest a using a 1/2"" mandrel style bender. These hard lines are coated with our proprietary ceramic coating that is engineered to withstand the crimping process required for beadlock fittings. The coating is extremely durable but it can be scratched. Care should be taken during the bending and installation process to prevent damaging the coating.