A 22mm outside diameter alloy bend, the smallest in this range and aimed at the fine plumbing rather than charge-air work. Typical uses are heater and coolant bypass routing, crankcase breather lines, water take-offs and vacuum or boost reference plumbing where you want a neat metal section instead of a long unsupported rubber hose. Cut the bend to the length you need, deburr the ends, and slip a short silicone coupler and clamp over each joint. A rigid alloy section here also stops small-bore hose from collapsing or kinking around tight corners, which is a common cause of restriction in coolant and breather circuits.