Stainless steel seamless tube to ASTM A269 - 316L. Tested and marked to ASTM A450. Suitable for high pressures, vacuums, impulsing and pressure surge applications. May be hydraulically bent in machine. Not suitable for potable water until the inside of the tube has been cleaned. These tubes are suitable for use with compression fittings. They are not suitable for threading ; for threading applications Schedule 40 (SCH 40) tube is used. See below for SCH 40 tube. Manufactured in the UK by a BS EN ISO 9001:2008 registered company.