Introducing the Copper Press CxFi Coupler Gas a quick, easy and permanent plumbing fitting developed with your comfort in mind. Manufactured using CW024A copper and CW511L brass, this fitting allows for safe, flame-free installation. Its not just simple to install; it provides reliable performance over time. Furthermore, it is suitable for use with hard, half-hard and soft copper tubes that are manufactured in accordance with EN 1057. What's more, the coupling incorporates a high quality HNBR O-ring, thus ensuring maximum security of operation over long periods of time.