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

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.

Buen producto aplica bien y es resistente

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.