A billet separator with a 7.9 mm bore, one step up from the smallest size in the range. This bore covers a lot of common small-bore plumbing: fuel return lines, gauge feeds and light braided hose runs that need supporting between anchor points. Left unsupported, a long span of small hose sags and sways with the engine, and over months that movement wears through the outer braid at every point it touches. The separator locks two lines together so they move as one and can be tied back to a bracket. Check the true outside diameter of your hose before ordering, as PTFE-lined and rubber-cored hose of the same rating are not the same size.