I have a ten year old home full of it and have suffered a leak just about every year. The leak itself is cheap, it’s all the water damage that follows that sucks. You can Google "Zurn class action" and read all about it.
My research shows that the problem lies in the crimp type fittings. To keep the flow going the inserts are very thin. When you crimp the band it tends to micro fracture the sleeve next to the body of the fitting. At some point it fails. If I recall right Zurn made the majority of the brass crimp fittings in question. Oh and they still make them. I think they changed the type of brass but they still make crimp fittings.
I have since heard that if you use the non crimp fittings you will not have issues. I think shark bite is of this type.
Only other thing I dug up on it was a manufacture's process that failed to seal / create the tube properly. This was limited to that manufacture and resolved pretty quick.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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