Compatibility: Standard 1/2" NPT fittings - female and male, compatible with most common shower arms in North America. Functions: The 90 degree shower elbow can change the angle of the arm without restricting water 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 performance without leaks. Reliable and rust-proof: This shower head elbow adapter is constructed as a single piece to reduce the risk of leaks and damage, resists rust and corrosion, and requires minimal maintenance. Easy to use: The shower arm extension can be operated smoothly even with wet or slippery hands. Simply tighten the rotating collar by hand without the need for a wrench.