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Q: Wouldn't this product allow air to enter the system when pushing it in w/ refrigerant? Vacuuming seems like it wouldn't b/c air would be vacuumed out.

If you install this oil injector in-line with the low side hose on your gauge set/manifold, you can pull vacuum on the hoses (remove air & moisture). Then, close off your valve to vacuum. Next, open up valve to your refrigerant tank, and charge the hoses with refrigerant. Finally, open the valve on the oil injector to allow the refrigerant from your gauge set/manifold to push the oil into the vehicle's A/C low side port. I do use a CPS MV5H3D 5-valve manifold (hi & low side hoses, refrigerant hose, vacuum hose, vacrometer all on one manifold) to limit the amount of things I have to assemble to do this (i.e., it's already set up, just connect hoses).

Q: If you continue to run the pump, wouldn’t that pull the oil right back out?

I'm not sure what you're asking, but this device allows you to add the proper type and quantity of oil to you HVAC system. That oil doesn't just sit there in the compressor, it disperses throughout the refrigerant, thereby lubricating the system. Honestly, my only concern with adding oil by this method is that it might dump too much oil too fast into the compressor and hydrolock the compressor. Hasn't ever happened, and I've used this thing dozens of times now on different units. Just make sure you're using the right oil and the right quantity. Since you can never be sure how much/type oil is in a system you're topping off, I vacuum pump the system down and then add the oil. Too much oil is as bad as too little. My actual steps are; recover/remove the old 134A....fix the leak......pump down the system...add I can 134A....add oil....add 134A until the gauges read correctly for the ambient air temperature. BTW; you will know you fixed the leak when the pump holds vacuum for 30 minutes (turned off).

Q: Can this be used as a nu calgon flush kit?

Dimitri, we're an auto repair shop and we sometimes use this for injection of oil/dye to the Auto A/C System through the low side port. Other times we use the automatic A/C equipment. It's just a small metal container of very good quality with the proper connecting fittings at each end. I'm not sure what exactly is the nu calgon flush kit but we use a larger container which holds more ounces for flushing Automotive A/C system.

Q: does this injector have 1/4" flare fittings or does it have 1/2" acne fittings?

The connector with the turning knob valve is 1/2" (which is outlet)the other end connector is 1/4",which is inlet from manifold gauges.

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🔧 Inject with precision, service with confidence.

BUILT TO LAST - Heavy-duty all-metal 2 oz canister designed for repeated, demanding professional use.
TRUSTED BY PROS - Mastercool’s reliable design backed by U.S.-based support keeps your service game strong.
PRECISION DELIVERY - Smooth, needle valve control ensures exact fluid flow between manifold gauge and A/C hose.
SEAMLESS COMPATIBILITY - Standard 1/2” ACME fittings integrate effortlessly with R134a automotive A/C service tools.
DUAL INJECTION FLEXIBILITY - Inject oil or UV dye via vacuum suction or pressurized refrigerant for ultimate control.

The MASTERCOOL 82375 is a professional-grade oil and UV dye injector designed specifically for R134a automotive A/C systems. Featuring a durable 2 oz metal canister, precision needle valve control, and standard 1/2” ACME fittings, it offers dual injection methods—vacuum suction or pressurized refrigerant—ensuring flexible, accurate delivery. Trusted by technicians, this tool combines rugged construction with seamless compatibility for reliable, efficient A/C maintenance.

Have a Question? See What Others Asked

Wouldn't this product allow air to enter the system when pushing it in w/ refrigerant? Vacuuming seems like it wouldn't b/c air would be vacuumed out.

If you continue to run the pump, wouldn’t that pull the oil right back out?

Can this be used as a nu calgon flush kit?

does this injector have 1/4" flare fittings or does it have 1/2" acne fittings?

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Manufacturer	Mastercool
Brand	MASTERCOOL
Model	R134a 2 oz Oil/Dye Injector
Product Dimensions	10.92 x 5.84 x 28.7 cm; 226.8 g
Item model number	82375
Exterior	Silver
Manufacturer Part Number	82375
Item Weight	227 g

MASTERCOOL 82375 R134A Oil Injector, Silver

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