About This

• ✔️ SAVE TIME — SEE YOUR R134a REFRIGERANT CONDITION BEFORE YOU FLUSH — Extracts a small 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 your 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 refrigerant sample. After inspection, the extracted refrigerant is safely returned to the A/C system — no refrigerant loss, no mess.
• ✔️ 60" R134a QUICK COUPLERS — FAST CONNECTIONS, MORE REACH — High Side (66234) and Low Side (66334) quick couplers snap directly onto service ports. Two 60-inch color-coded nylon barrier hoses give you 24 more inches of reach than competing 36-inch kits — no repositioning equipment mid-job.
• ✔️ COMPLETE KIT IN A PROTECTIVE BLOW MOLDED CASE — Includes sight glass (53375), R134a retrofit adapter (82274), 60" blue hose (53376-601), 60" red hose (53376-603), High Side coupler (66234), Low Side coupler (66334), 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.