16" 40cm Ceiling Mount Rain Shower Head Extension Arm with 1/2" NPT Pipe. Extendable shower arm for ceiling application. For bathrooms with tall ceilings, this 16 ceiling-mount shower arm allows you to install a Modern Rain or Square Rain showerhead lower in your shower for a more gentle rainfall.18 x 2.5 x 3.5 inches. The item "16 40cm Ceiling Mount Rain Shower Head Extension Arm with 1/2 NPT Pipe" is in sale since Monday, October 28, 2019. This item is in the category "Home & Garden\Home Improvement\Plumbing & Fixtures\Shower Heads". The seller is "horizongrp" and is located in McLean, Virginia. This item can be shipped worldwide.