I used the couplers on a hydraulic grapple for my kubota tractor. They worked great for about 2 weeks and then the female ends began to leak out of the connector. (Not at the threads at the actual connector) I figured well stuff happens so I asked for an exchange. Surely the next ones won't leak. I received the new ones after a short time, put those on and again they worked great for around 2 weeks and leaked out of the same connector spot. I have now learned not to use cheap hydraulic connectors. They won't hold up to everyday heavy use. I have used stucchi connectors on the backhoe and while they are literally 4 times the cost. They don't leak. The seller and customer service is awesome, but the product is not.
Note: by leak i'm not talking a few drips. I'm talking 2 quarts in an 8 hr period. That is expensive when the fluid you are required to use is $6 a quart.