A billet separator with a 19.1 mm bore, listed for AN10 hose. At this size you are typically plumbing high-volume fuel feed, oil cooler or dry sump lines, and the hose itself is heavy enough that an unsupported span puts real load on the hose ends and the components they thread into. Clamping two lines together and anchoring them to structure removes that stress and stops the pair swinging into anything nearby. Because larger hose is stiffer, route the lines first and place the separator where the run naturally sits rather than using it to force a bend. Check your hose outside diameter suits the 19.1 mm bore before ordering.