Review on MASTERCOOL 90262 Manual Shut Off Adapter by Jorge Tupou

I'm a little disappointed! I really only need one check valve on the high pressure side, but thought it would be nice to have a set of three in case one of them breaks. I've serviced about 15 units with this and then the o-ring flew out after unplugging it from the unit! Then I put on one of the others and did about 3 more sets before THAT 0-ring fired too! Maybe it wouldn't be so bad if I could find the 0-ring after they shot through the hose, but I couldn't. Now I have the last one left of this three pack! Hope this one lasts a while. I think from now on I'll switch to the "Yellow Jacket" because I think you get what you pay for.