Boltigen AC Oil & Dye Injector for R1234yf R134a R410a — 2 oz Handheld Injector with Backflow Prevention

Boltigen AC Oil Injector Kit is a handheld refrigerant oil and fluorescent dye injector engineered to add lubricant or dye safely into R1234yf, R134a and R410a air-conditioning systems while preventing backflow.

This compact kit gives technicians and DIYers a controlled way to introduce up to 2 ounces of oil or leak-detection dye into vehicle and small-split HVAC systems. Built with an aluminum hand body, brass fittings and durable rubber hose, the tool set includes pressure-port couplers for R1234yf, R134a and an R410a adapter plus accessories for convenient, repeatable use.

How does the injector keep refrigerant from flowing back?

The injector uses a built-in check valve that isolates the tool from the system once fluid is dispensed. That backflow prevention feature reduces the chance of refrigerant or oil returning into the injector barrel and helps protect the operator and the tool. Tight threaded connections and a 1/4" SAE brass fitting further secure the interface.

• Internal check valve prevents reverse flow during or after injection
• 1/4" SAE brass connector ensures a tight, leak-resistant seal
• Hand-turn aluminum body allows controlled dispensing of oil or dye

Which refrigerants and fluids is the kit compatible with?

This injector is designed to work with common automotive and small HVAC refrigerants — R1234yf, R134a and R410a — through the included low-side couplers and adapter. It accepts POE and mineral oils and is also suitable for fluorescent leak-detection dyes made for HVAC/R. Use only compatible, manufacturer-recommended oils and dyes.

• Includes R1234yf and R134a low-side snap-on couplers and an R410a adapter
• Works with POE, mineral oils and typical fluorescent HVAC dyes
• Suitable for car AC systems and many residential/small commercial units

How do you load and operate the oil/dye injector?

Fill the clear cylinder with the required amount (up to 2 ounces) of oil or dye, then screw the check-valve assembly onto the cartridge and tighten. Bleed any trapped air by turning the inner core slightly, attach the appropriate low-side coupler, and slowly dispense the fluid while monitoring system pressures.

• Fill inner cylinder with measured fluid volume (2 oz typical capacity)
• Tighten check valve and rotate inner core to purge air before use
• Snap low-side coupler onto service port and press or twist to inject

What materials and accessories are included, and how durable is it?

The main body is CNC-friendly aluminum alloy for a robust, corrosion-resistant grip; the 1/4" SAE connector is brass for long-lasting sealing performance, while the thick rubber hose resists kinks and wear. The kit comes with a valve core remover, gloves, and a storage pouch to keep parts organized and protected on the job.

• Aluminum hand body, brass 1/4" SAE connector, thickened rubber hose
• Includes valve core remover, white gloves, and black flannelette storage pouch
• Compact kit designed for frequent service use and easy transport

Who is this for: Boltigen's AC Oil Injector Kit is aimed at automotive technicians, HVAC service professionals and skilled DIYers who need a precise, portable tool for adding oil or fluorescent dye to R1234yf, R134a or R410a systems. If you perform routine AC maintenance, diagnose leaks with dye, or want a safer method to introduce lubricant into small systems, this kit provides the adapters, fittings and durability required for reliable on-the-job performance.