DURABLE ACETAL CONSTRUCTION: Crafted from acetal copolymer, this union tee fitting offers superior strength & heat resistance compared to polypropylene, ensuring long-lasting performance in demanding environments. The high-quality material makes it perfect for use in reverse osmosis systems & water filtration applications, providing reliable connections for plumbing & home improvement projects. It is also compatible with CO2 line, pneumatic, & vacuum setups, making it a versatile tube connector.