Capri Tools 3/16 in. Double Flaring Tool CP21110-316 — Compact 45° SAE Flare, On‑Vehicle Ready

Capri Tools 3/16 in. Double Flaring Tool (CP21110-316) is a compact, all-in-one flaring tool that makes precise 45° SAE double flares on 3/16 in. tubing faster and with less setup than older flaring methods.

This lightweight tool is built for mechanics, DIYers, and restoration enthusiasts who need reliable double flares on brake, fuel, and hydraulic lines made from non-stainless steel, nickel, or copper tubing. Designed to work on-vehicle in tight spaces or detached for use in a bench vise, it streamlines the flaring process so you spend less time preparing and more time finishing the job. The removable die and minimal extra-tool requirement keep the setup simple: just a 10 mm and a 17 mm wrench are needed.

How does this tool speed up creating 45° SAE double flares?

The CP21110-316 reduces steps compared with traditional multi-part flaring kits by combining clamping and forming actions in a single compact unit. Its efficient design minimizes repositioning and tool changes so each flare takes less time from start to finish.

• Integrated clamp and cone for faster cycle times
• Pre-aligned die minimizes re-adjustments
• Detachable die lets you finish stubborn jobs in a bench vise
• Works directly on-vehicle to avoid tubing removal delays

What tube materials and sizes is the tool compatible with?

This model is engineered specifically for 3/16 in. (approximately 4.75 mm) tubing and performs best with non-stainless steel, nickel, and copper lines commonly used in automotive brake and fuel systems. It is not intended for stainless steel tubing; using appropriate tubing types ensures clean, consistent double flares.

• Designed for 3/16 in. SAE tubing only
• Best results on non-stainless steel, nickel, and copper
• Creates standard 45° SAE double flares for fittings
• Not rated for hardened stainless steel tubing

Can I use the tool when the line is already on the vehicle and in tight spaces?

Yes — the compact footprint of the Capri Tools flaring tool lets you clamp and flare lines while they remain mounted in many on-vehicle situations. Its portability and short body help reach constrained areas where full-size flaring kits won't fit, reducing the need to disconnect or remove lines.

• Compact design fits tight engine bays and undercarriage spaces
• Short handle and body reduce interference with surrounding components
• Die can be removed to reposition or use a bench vise when needed
• Requires only common 10 mm and 17 mm wrenches for setup

What other tools and accessories are required to begin flaring?

The CP21110-316 is essentially a self-contained flaring solution; besides the tool itself you only need two common wrenches to secure and operate it. Because the working die detaches, you can add a bench vise for extra holding power if the job or tube condition calls for additional stability.

• All-in-one clamp and flaring head included
• Only a 10 mm and a 17 mm wrench are required
• Optional bench vise can hold the detached die for tougher jobs
• No extra flaring adapters are necessary for 3/16 in. tubing

Who this tool is for: The Capri Tools CP21110-316 suits professional technicians, home mechanics, and hobbyists who work on brake, fuel, or hydraulic lines and want a faster way to produce consistent 45° SAE double flares on 3/16 in. tubing. If you frequently perform repairs on-vehicle, need to flare in tight spaces, or prefer a portable, low-tool-count solution, this compact flaring tool will simplify your workflow and help you get accurate results without bulky kits.