Compatibility: Standard 1 or 2" NPT fittings - female and male, compatible with most common shower arms in North America. Functions: The 90 degree shower elbow not only can change the angle of the arm , but does not restrict flow or pressure.It can be rotated after installation to make it more efficient to use.This shower head connector fits most standard shower fittings (such as the shower arm shower, shower head, shower base and hose) and also widely used in home, bathroom, kitchen, RV etc. Durable Material: The heavy solid brass body of this shower head extension has much higher performance (high heat resistance, high corrosion resistance and high pressure resistance), more durable and harder than ordinary brass and plastic tubing.You can get a shower head adapter that can be used vir many years without leaking. Reliable and rust-proof: this shower head elbow adapter is made in one piece to reduce leaks and damage, protecting against rust and corrosion and requiring minor maintenance.Easy to use: You can use this shower arm extension easily and smoothly even with wet and slippery hands. Simply tighten the rotating collar by hand without a wrench.