Zurn developed its QickSert 1 PEX joining system over 30 years ago. Since then it has become the standard in the industry. It is the most time tested and reliable fitting system available. The fittings are actually stronger than the pipe itself and once crimped, they can not be pulled apart or blown out. The tubing will fail before the fittings, which requires many times more pressure than your plumbing system will ever encounter. Its efficient design and ease of installation ensures a prefect connections every time, giving you a plumbing system that will be worry free for a lifetime.