Konohan 100 Pieces Air Hose Fittings Air Line Fittings Straight Push to link 4 6 8 10 12 mm Quick Release Pneumatic Connectors Plastic Straight Tube Connector Push to Connect Fittings for Tube

Great value for the money, have used 5 from this kit so far repairing air lines on construction equipment, hard to find metric fittings at stores

They fit and they don't leak. I have used several of them already. No leaks

The assortment is handy to have in the shop.

First off I don't like plastic piece of crap but for Quickie's places on the road they'll do just fine

These are good to have for commercial trucks etc.

They are good to have as a backup in case an airline breaks. They do hold. Recommend all truckers to have this in your truck

These quick connects did not specify a psi rating (unless i missed it) but I installed one on my truck to an air hose connected to the air tank which carries about 110-120 psi and it came apart on more than one occasion, compromising my air brakes.. The actual assembly came apart not just where the hose is inserted. I would not recommend for air pressure systems in that range.