A billet separator with a 27.0 mm bore, sized for the largest hose and tube in most builds. At this diameter you are usually dealing with high-volume transmission cooler lines, big oil circuits or heavy fuel plumbing, where the filled hose has real mass and needs proper support rather than a cable tie. The separator clamps two lines into a single rigid unit that can be bolted to a chassis rail or bulkhead bracket, taking the load off the hose ends entirely. Plan mounting points before you cut hose to length, so the separator positions fall where there is structure to fasten to. Confirm your hose outside diameter matches the 27.0 mm bore.