Mastercool 43301-A 27‑Piece Radiator Pressure & Vacuum System Kit – Professional Leak Tester & Coolant Refill Tool with Durable Gauge and 19 Adapter Set (0–35 psi)

OverviewThe Mastercool 43301-A 27‑Piece Radiator Pressure and Vacuum System Kit is designed for professional technicians who need to accurately test cooling systems and refill coolant efficiently. Combining pressure and vacuum functionality, this kit provides everything needed to detect leaks, prevent air pockets, and streamline service.Key FeaturesHand pump with 0–35 psi gaugeVacuum purge and refill toolThermometer and universal radiator capCoolant hose and installation accessoriesBlue and black test connectors (R123/R125 and R123/R124)19 adapters: #2–#4 (steel), #6–#17, #19, #21–#23 (aluminum)Why MastercoolMastercool tools are engineered for performance, precision, and durability. This professional-grade kit stands apart from budget alternatives by using high-quality materials and delivering secure connections for consistent results. Ideal for shops that prioritize accuracy and efficiency.Technical SpecificationsKit Type: Radiator Pressure & Vacuum Refill KitPressure Range: 0–35 psiTotal Pieces: 27Adapter Numbers: #2–#4 (steel), #6–#17, #19, #21–#23 (aluminum)Cap Connectors: R123/R125 (blue), R123/R124 (black)Applications: Most domestic and import vehicles

• ✔️ 27‑PIECE PROFESSIONAL KIT – Includes hand pump, vacuum refill tool, thermometer, universal radiator cap, coolant hose, cap connectors, and 19 radiator adapters
• ✔️ PRESSURE + VACUUM FUNCTIONALITY – Diagnose both external and internal cooling system leaks and refill coolant without introducing air
• ✔️ ACCURATE 0–35 PSI GAUGE – Durable, workshop-tested pressure gauge ensures precise and consistent readings
• ✔️ 19 VEHICLE-SPECIFIC ADAPTERS – Includes adapters #2–#4 (steel) and #6–#17, #19, #21–#23 (aluminum), plus blue and black cap connectors (R123/R125 and R123/R124)
• ✔️ BUILT FOR LONGEVITY – Aluminum and steel construction with reinforced fittings for daily shop use
• ✔️ SECURE CONNECTIONS AND SEALS – Avoids the issues found in lower-cost kits with loose-fitting plastic parts
• ✔️ U.S.-BASED CUSTOMER SUPPORT – Backed by Mastercool’s responsive and knowledgeable technical service team