Mastercool 53123 Refillable Universal Oil and Dye Injector – Includes 2 oz Concentrated A/C Dye (25 Applications) and Auto Shut-Off Valve Adapter – Compatible with Most A/C Systems

Mastercool 53123 Refillable Universal Oil and Dye Injector The Mastercool 53123 is a refillable, technician-grade injector designed for fast, accurate delivery of refrigerant oil or UV dye into automotive A/C systems. It features a rugged 2 oz aluminum body, a smooth twist-handle for controlled dosing, and includes a 2 oz bottle of concentrated dye (25 applications) plus an auto shut-off valve adapter. Operation Instructions: - Purge air from the hose by turning the injector handle clockwise while holding it upright. Use a pen to depress the coupler valve to release trapped air. - For concentrated dye: turn handle 1 to 1¼ times. - For standard dye: turn handle 3½ times. - For oil: turn handle approximately 3¼ times to inject ¼ oz. Application Chart: - 1 application for systems with up to 10 oz (300 ml) of lubricant - 1 application for systems with up to 7 lbs (3.2 kg) of refrigerant Safety Warnings: ✔️ Wear safety glasses and gloves when injecting dye or oil ✔️ Do not breathe refrigerant vapor ✔️ Always wear UV glasses when using UV lights ✔️ Do not touch hot lamp surfaces Built for professional results. Backed by Mastercool’s U.S.-based support and over 40 years of HVAC/R expertise.

• ✔️ UNIVERSAL OIL & DYE INJECTOR – Designed for fast and accurate injection of A/C lubricant or fluorescent dye into low-side service ports.
• ✔️ EASY Twist-to-Inject OPERATION – Simply connect to the system and turn the handle to deliver the desired amount of fluid.
• ✔️ 2 oz Refillable Capacity – Ideal for controlled injection; features an anodized aluminum body with clear markings for precision.
• ✔️ Includes 2 oz Universal Fluorescent Dye – Concentrated dye supports up to 25 applications and is compatible with most automotive refrigerants.
• ✔️ Auto Shut-Off Valve Adapter Included – Ensures a secure connection and smooth flow during servicing.
• ✔️ Professional Quality Construction – Durable materials and field-proven design built to withstand daily shop use.
• ✔️ Backed by Mastercool’s U.S.-Based Support – Trusted by A/C service professionals worldwide for performance and reliability.