FANOVO 1234YF AC Dye Injector 2 oz — Shut-Off Ball Valve & Backflow Preventer with R134a/R1234yf/R410 Adapters

FANOVO 1234YF AC Dye Injector is a 2 oz HVAC oil and fluorescent dye injection tool with a shut-off ball valve and built-in backflow preventer for safe, controlled dye charging into R134a, R1234yf and R410 systems.

This compact injector combines a push-in 2 oz reservoir, etched volume markings, and a knurled aluminum handle for easy, precise dye or oil dosing into automotive and residential or commercial AC systems. It ships with three low-side pressure adapters (R1234yf, R134a, R410), a valve core remover and gloves, enabling technicians and DIYers to trace leaks and add lubricant without cross-contamination or mess.

How does the shut-off ball valve and backflow preventer protect my system?

The integrated shut-off ball valve gives you immediate control over flow, letting you stop injection without disconnecting. The built-in backflow preventer on the 1/4" SAE connection stops refrigerant from entering the injector, reducing contamination risk when changing cartridges or adapters.

• Shut-off valve lets you start/stop flow quickly for precise dosing
• Backflow preventer protects injector and cartridge from refrigerant ingress
• 1/4" SAE connector compatible with standard low-side fittings

Is the FANOVO injector compatible with different refrigerant types and systems?

Yes — the tool was designed to work with R134a, R1234yf and R410A systems, and is suitable for automotive, residential and light commercial air conditioning. The kit includes three low-side adapters so you can switch between common service ports without improvising fittings.

• Adapters for R1234yf, R134a and R410 included
• Works on vehicle and building AC low-side service ports
• Knurled handle and etched markings ease accurate charging across systems

What materials and construction ensure durability and safe connections?

The injector body is machined from aluminum alloy for low weight and corrosion resistance, while the adapters and 1/4" fittings are solid brass for reliable threads and sealing. A thickened rubber hose provides a flexible, leak-resistant link between injector and system during service work.

• Aluminum alloy body resists corrosion and is lightweight
• Solid brass adapters deliver strong threaded connections
• Durable rubber hose prevents kinks and maintains safe flow

How easy is it to set up and use the injector for a novice?

Assembly is straightforward: tighten the check valve to the cartridge, screw inner and outer cylinders clockwise, then purge a small amount through the 1/4" SAE inner core to remove trapped air. The etched volume markings, knurled handle and included gloves help ensure a clean, controlled operation even for first-time users.

• Push-in 2 oz reservoir with etched capacity markings for accurate dosing
• Simple screw-together assembly and one-step air purge procedure
• Includes valve core remover and gloves for safe handling and port access

Who this is for: FANOVO's 1234YF AC Dye Injector is aimed at HVAC technicians, automotive mechanics and informed DIYers who need a compact, reliable tool for injecting fluorescent dye or oil into refrigeration systems. It’s especially useful when diagnosing leaks, adding lubricant during service, or when working across multiple refrigerant types and service ports. If you want controlled dosing, backflow protection and a kit that includes the common low-side adapters and accessories, this injector is built for those tasks without the bulk of larger rigs.