Mastercool 43301-A Radiator Pressure & Vacuum System Kit, 27-Piece, 0-35 psi Gauge, 19 Adapter Set
- The Mastercool 43301-A is a 27 piece radiator pressure and vacuum refill kit with a 0-35 psi gauge, designed to test, detect, and repair coolant system leaks while purging air and refilling coolant efficiently. It serves professional automotive technicians working on both domestic and import vehicles.
- Features:
- 0-35 psi rated hand pump gauge lets you test cooling system pressure and identify external and internal leaks such as blown head gaskets or cracked blocks.
- Vacuum purge and refill tool allows cooling systems to be refilled without introducing air pockets, improving system reliability.
- Includes both blue and black radiator cap test connectors for R123/R125 and R123/R124 caps to ensure compatibility with various radiator and system cap configurations.
- Packaged in blow-molded case with 19 adapters (steel and anodized aluminum), thermometer, universal radiator cap, coolant hose, hand pump, and all seals; adapters numbered and color coded to fit most popular domestic and import filler necks.
- Includes:
- Hand pump with gauge (0-35 psi)
- Vacuum purge and refill tool
- Thermometer
- Universal radiator cap adapter
- Coolant hose with quick-coupler
- Blue radiator cap connector for R123/R125
- Black radiator cap connector for R123/R124
- 19 radiator cap/filler neck adapters, including steel #2, #3, #4; aluminum #6-#17, #19, #21-#23 adapters numbered per Mastercool parts list.
- Blow-molded storage case
- Specifications:
- Manufacturer: Mastercool
- Part Number: 43301-A
- Number of Pieces: 27 distinct components
- Test Range (Pressure): 0-35 psi
- Adapter Materials: Steel for adapters #2, #3, #4; Aluminum for #6 through #17, #19, #21 through #23
- Cap Connector Types: Blue R123/R125, Black R123/R124
- System Compatibility: Designed for testing, diagnosing, and servicing radiator cooling systems in vacuum-type cooling environments; fits many domestic and import vehicles; includes multiple adapters to match various radiator/filler neck shapes; purges air and refills coolant without introducing air.
- The Mastercool 43301-A can also be referred to as Mastercool radiator pressure vacuum refill kit 43301-A, Mastercool 27-piece coolant system leak tester, Mastercool 19-adapter radiator cap tester set, professional coolant refill pressure tester, and Mastercool complete auto radiator pressure vacuum system tester 0-35 psi
Mastercool is a family-owned manufacturer of professional HVAC/R and automotive A/C service tools and equipment, including manifolds, gauges, vacuum pumps, recovery units, leak detectors, and fittings.
Q: Will this kit leak-test both radiator caps and cooling system lines?
A: Yes, using the included radiator cap connectors (blue and black) you can test cap integrity, while the hand pump pressurizes the entire system to expose leaks in hoses, gaskets, or the engine block.
Q: Can I purge and refill my coolant with this kit without creating air pockets?
A: Yes; the kit includes a vacuum purge and refill tool plus a coolant hose designed to pull coolant into the system under vacuum, minimizing trapped air which often causes overheating or improper circulation.
Q: What pressure should I use when testing typical automotive radiator systems?
A: Most systems are tested to around 15-20 psi for domestic vehicles; always check vehicle manufacturer’s specifications before testing. Overpressurizing above system-rated values can damage radiator, hoses or cap.
