Compatibility: Standard 1/2" NPT fittings - female and male, compatible with most common shower arms in North America. Functions: The 90 degree shower elbow changes the angle of the arm without restricting flow or pressure. It can be rotated after installation for more efficient use. This shower head connector fits most standard shower fittings such as shower arms, shower heads, shower bases, and hoses, and is widely used in homes, bathrooms, kitchens, and RVs. Durable Material: The heavy solid brass body offers high heat resistance, high corrosion resistance, and high pressure resistance, making it more durable and stronger than ordinary brass and plastic tubing. This shower head adapter provides long-lasting, leak-free performance. Reliable and rust-proof: This shower head elbow adapter is constructed as a single piece to reduce leaks and damage, resists rust and corrosion, and requires minimal maintenance. Easy to use: The shower arm extension can be easily tightened by hand, even with wet or slippery hands. Simply secure the rotating collar without the need for a wrench.