Boltigen AC dye oil injector kit – Low‑side HVAC backflow preventer with R134A, R1234YF & R410 adapters, 7.5–60 ml dosing

The Boltigen AC Dye Oil Injector Backflow Prevent Kit is a compact HVAC toolset for safely injecting oil and fluorescent dye into low‑pressure refrigerant lines, with adapters for R134A, R1234YF and R410 systems and a built‑in backflow check valve.

Whether you service automotive air conditioners, home split systems or light commercial refrigeration, this kit provides a measured oil/dye cylinder, durable fittings and three common low‑side adapters so you can introduce lubricant or tracing dye through the suction side without contaminating your recovery equipment. Components are brass, reinforced rubber hose and an anodized aluminium alloy injector body designed to resist corrosion and pressure typical of A/C service work. The kit supports POE and mineral oils and works with most fluorescent leak detection dyes used in HVAC and automotive systems.

How do I connect the injector to my system?

Attach the correct quick coupler adapter to the low‑pressure service port, then hook the injector hose to that coupler. The kit includes an R134A 1/4" SAE low‑side coupler, a blue R1234YF 14 mm female coupler and an R410 mini‑split adapter; select the adapter that fits your port and ensure the check valve is tightened before introducing oil or dye.

• Match adapter to service port (R134A, R1234YF, R410).
• Thread the 1/4" SAE fittings hand‑tight, then secure with a wrench if needed.
• Confirm backflow check valve is installed and tightened to prevent refrigerant return.

What volume and fluids can the injector handle?

The injector cylinder range covers small to moderate top‑ups — from 1/4 oz (7.5 ml) up to 2 oz (60 ml) — letting you add precise amounts of oil or dye for diagnostics and maintenance. It is compatible with common fluorescent dyes and both POE and mineral oils, making it suitable for most passenger vehicles and many HVAC units.

• Fillable capacity options: 7.5 ml to 60 ml for controlled dosing.
• Works with fluorescent leak detection dyes and lubricants (POE/mineral).
• Not intended as a bulk charging device; for targeted injections only.

How does the backflow prevention and safety work?

The injector uses a 1/4" SAE port equipped with a check valve to stop refrigerant from flowing back into the oil/dye reservoir or the service hose. Brass fittings, reinforced rubber hose and an aluminium alloy body combine to resist corrosion and pressure, while the check valve reduces contamination risk when connecting or disconnecting under low‑side pressure.

• Integrated check valve on the 1/4" SAE port prevents reverse flow.
• Brass fittings and reinforced hose for pressure and corrosion resistance.
• Aluminium alloy injector body for lightweight durability in the field.

How do I operate the injector and measure the dose?

Fill the oil cylinder with the desired amount, screw the check valve onto the cartridge, then tighten the inner and outer cylinders clockwise. Use the small 1/4" SAE threaded core to expel trapped air from the line; connect to the low‑pressure port and inject the required amount by manipulating the inner cylinder to push fluid into the suction side.

• Fill cylinder to the required mark (up to 60 ml) before attachment.
• Tighten inner/outer cylinders clockwise to seal and prepare for dispensing.
• Use small core to purge air, then connect to low‑side port and inject slowly.

Who this kit is for: HVAC technicians, mobile auto A/C specialists and DIYers comfortable with refrigeration service will benefit most from this Boltigen injector set. It’s geared toward tasks that need precise small‑volume oil or dye addition and leak tracing across passenger vehicles, mini‑split systems and many residential HVAC units. It is not a substitute for refrigeration charging stations or bulk refrigerant handling — always follow refrigerant safety and environmental regulations when servicing systems.