About This

• ✔️ SAVE TIME — SEE YOUR R1234yf REFRIGERANT CONDITION BEFORE YOU FLUSH — Extracts a small R1234yf refrigerant sample for direct visual inspection through the transparent sight glass. Identify excess dye, oil contamination, or debris before committing to a costly system flush. Know exactly what the system needs.
• ✔️ INCLUDES 10-CONDITION REFRIGERANT CONTAMINATION CHART — Compare your sample against 10 documented conditions — excess UV dye, leak tracing dye, moisture, carbonized oil, metal chips, compressor overheating, bad leak stop agents, aged seals, flushing residue, and oil imbalance — for an accurate diagnosis before any repair.
• ✔️ WORKS WITH VACUUM PUMP OR R/R/R MACHINE — 3-MINUTE PREP — Compatible with any standard vacuum pump or the vacuum function on a Recovery/Recycle/Recharge machine. Blue hose and coupler include auto-shutoffs to hold vacuum after disconnection. Clear step-by-step instructions included for both methods.
• ✔️ BALL VALVE CONTROLLED — EXTRACT AND FULLY REDEPOSIT WITH ZERO WASTE — Precision ball valves on both sides provide leak-free control of the R1234yf refrigerant sample. After inspection, the extracted refrigerant is safely returned to the A/C system — no refrigerant loss, no mess.
• ✔️ 60" R1234yf QUICK COUPLERS BUILT FOR MODERN VEHICLES — High Side (67434) and Low Side (67534) R1234yf quick couplers snap onto modern A/C service ports. Adapter (84274) includes valve core. Two 60-inch SAE J2888-rated nylon barrier hoses — 24 inches longer than competing 36-inch kits.
• ✔️ COMPLETE KIT IN A PROTECTIVE BLOW MOLDED CASE — Includes sight glass (53375), R1234yf adapter with valve core (84274), 60" blue hose (53376-601YF), 60" red hose (53376-603YF), High Side coupler (67434), Low Side coupler (67534), and contamination chart — custom-fit and ready to use out of the box.
• ✔️ MASTERCOOL QUALITY — U.S. DESIGNED, 40+ YEARS, 76+ COUNTRIES — Mastercool has been a trusted name in professional automotive A/C and HVAC service tools for over four decades. U.S. designed with U.S.-based customer and technical support available when you need it.