What condition may occur to a Teflon hose that has been in service for some time?

A Teflon hose, due to its material properties and long-term exposure to various conditions, can indeed develop a "set shape" over time. This occurs when the hose is subjected to constant pressure or bending in certain positions. The set shape means the hose may have a tendency to remain in that specific configuration when removed from its application. Supporting the hose in its installed position is critical to prevent kinking or stress at any point, which can lead to failures.

While it's important to understand that Teflon is known for its excellent chemical resistance and high-temperature stability, it's also susceptible to physical changes when continuously subjected to specific conditions. This characteristic highlights the need for proper installation techniques, including the use of supports to maintain the integrity and functionality of the hose over its lifetime.