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MASTERCOOL 91339 R134A Ring Assortment Review

6

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Very good

Revainrating 4.5 out of 5  
Rating 
4.7
❄️ Air Conditioning Tools & Equipment, 🔧 Automotive Tools & Equipment

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Description of MASTERCOOL 91339 R134A Ring Assortment

Automotive R12 and R134a O-Ring Assortment. 270 piece assortment. SUPERIOR SEALING to prevent unwanted leaks. 270 PIECES with 18 different sizes for a variety of applications.

Reviews

Global ratings 6
  • 5
    4
  • 4
    2
  • 3
    0
  • 2
    0
  • 1
    0

Type of review

Revainrating 5 out of 5

Ideal! Every time I needed an AC o-ring

Perfect! Every time I needed an AC O-ring I had to search through the entire range to find the right one. This kit has all the sizes I need in one package.

Pros
  • Delivery was very fast
Cons
  • Updates

Revainrating 5 out of 5

Worth Every Penny - Air Conditioning Tools & Equipment

When you consider how bad it can be when an O-ring fails and how hard it is to find one at this point, having a set like this on hand is priceless. The o-rings in this kit are nice to the touch and they have all held up great since installation. Having lots of extras is a great peace of mind.

Pros
  • Gotcha!
Cons
  • The list will be long.

Revainrating 4 out of 5

Buy a vehicle specific kit

Good choice for the price but if you are planning to rebuild a car air conditioner (R12 or R134a) you definitely cannot replace all your o rings with this kit . I recently replaced all of the o-rings in my '94 Chevrolet and 2009 Kia Rio trucks that I purchased vehicle specific o-ring kits for, and just for comparison I have this kit in the correct o-ring location during repairs Size checked and any O-rings not included in this kit can be used. The problem is that many o-rings had the correct…

Pros
  • High marks for tester support and durability
Cons
  • Some little things

Revainrating 5 out of 5

Quality Air Conditioning O-ring Service Kit

O-ring kit contains different sizes of O-rings. The picture shows the dimensions printed on the storage case, the kit I received is not labeled as in the picture below. If you are looking for a quality kit then look no further. I recently used the o-rings from this kit to repair a leaking air conditioning system where the system had only recently been serviced by a local air conditioning technician. I determined that the newly installed o-rings were the cause of the leak, when I removed and…

Pros
  • Free for training purposes
Cons
  • Uncertain