Heat-Shrink Boa Clamps: The First Hose Clamp Redesign Since the 1921 Jubilee Clip

The worm-drive hose clamp in most engine bays traces its shape to 1921, when Commander Lumley Robinson started turning out the Jubilee Clip in Gillingham, England. A stamped steel band with a small slotted screw housing looked like a clever fix at the time. A century later, that same screw housing still loosens after heat cycles, slices knuckles, and bites a groove into rubber hoses.

Jon Petty launched Hose Candy at the SEMA Show in November 2009 from OOMPH Labs LLC in St. George, Utah. The booth showed a different approach: Boa Clamps, heat-shrink clamps with no screw thread to back off. The brand picked up two SEMA Global Media Awards in 2011, one for Barb Bites and one for Hose Skins. More telling than the trophies is who kept using the parts.

Worm-drive clamps won on cost

Stamped steel and a threaded screw could be mass produced cheaply, and that is why the worm-drive clamp became the default. Spring clamps and T-bolt clamps have their jobs, but the generic replacement in most bays stayed the slotted band. Holding tension over repeated heat cycles was never its strength.

Every drive runs the same cycle. The coolant warms, the rubber hose expands, and the steel band resists. The screw housing stays put while the hose changes shape under it. After enough heating and cooling, the rubber compresses and the clamp loses grip. You retighten it. The hose wears a new groove, and the seepage returns around the radiator neck or heater fitting.

That slotted band has another habit. When a screwdriver slips off a rusty hex head, the band edge opens a cut along your finger. It has happened in driveways and service bays for decades.

Dynamic Tension removes the thread

Boa Clamps drop the screw entirely. The patent covers what Hose Candy calls Dynamic Tension Technology. You slide the clamp over the hose end, heat it with a heat gun, and the clamp shrinks to match the fitting and hose profile under it. As the engine cools, the clamp contracts and grips tighter. That flips the old failure mode: cooling used to mean a looser worm gear. With a Boa Clamp, cooling is when the grip improves. It never needs retightening.

The size range covers common engine bay hose ends from radiator necks to heater lines, and the low-profile finish leaves room in bays where turbo plumbing, plastic covers, and fan shrouds crowd every hose.

• Sizes from about 1/2 inch to 3-1/2 inches
• Corrosion-resistant, so no rusted bands
• Reusable and adjustable after heating
• Low-profile finish that clears turbo and coolant plumbing
• Removed with a Hose Candy clamp removal tool or a soldering iron

Nothing protrudes. No screw housing needs clearance for a driver or socket. On turbo cars with tight routing, plastic covers, and fan shrouds close to the hoses, that low profile saves both time and skin.

Builders kept the part

Ringbrothers, the muscle car builders Mike and Jim Ring, use and co-brand Hose Candy products on their builds. A show car builder cannot afford a clamp that loosens on the drive back to the trailer. Those cars run hot, sit in traffic, and race. The U.S. Military also lists Hose Candy among its suppliers for service and fleet work. Corrosion resistance and a no-retightening clamp matter when a vehicle has to come back from the field without a maintenance stop.

That track record traces to the product's behavior, not its looks. The clamp grips harder as the engine cools. It has no screw to walk out. It installs in about sixty seconds with a heat gun.

Install once and skip the retightening

The old pattern was tighten, drive, retighten, and still find a damp line at the hose end. Boa Clamps follow the same logic as the rest of the Hose Candy line. Sidewinders turn vacuum and turbo hoses into quick-connect couplers. Hose Skins cover the hose without disconnecting hard lines. Boa Clamps finish the ends. Install once, get a repeatable result, and skip the retightening step at the next service.

For the hose itself, that means no steel band slowly carving a groove into the rubber. The hose stays round. For the builder, the finished bay keeps a clean, low edge at every hose end. That is the sweeter way to close out the details under the hood.

If your hose ends are the one detail spoiling an otherwise clean build, start with the Boa Clamps collection. The install tutorials show the heat-gun process and removal. If vacuum lines are the next weak spot, the Sidewinders collection turns them into quick-connect couplers.