A billet separator bored to 20.6 mm, covering hose that falls just above the common AN10 outside diameter. Large-bore plumbing carries significant weight once filled, and a run of it left hanging between two fittings will work the hose ends loose over time and transmit every engine vibration into the chassis as a drone. Holding two lines in a rigid separator and tying that back to a bracket solves both problems at once and produces a far tidier installation. Route and settle the hoses in their final positions before clamping so the separator is not fighting the natural path of the run. Verify your hose outside diameter against the 20.6 mm bore.