There has long been a standard size for shower fittings in the United States. All of our shower heads and shower arms meet this standard. Also, this means all our shower heads and shower arms are compatible with any other standard heads or arms, and you can easily replace just a shower head if you like and keep your existing shower arm. Similarly, you can keep your current shower head if you like and upgrade just the shower arm. It is highly unusual to find shower heads and arms already installed that are not the standard size.
The standard size and threading is called 1/2" NPT (for 'National Pipe Thread - Tapered). It is also referred to as MNPT, MPT or NPT(M) for male threads, and FNPT, FPT or NPT(F) for female threads.
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