All pipe is to be hollow throughout the entire length.
All pipe is to be made of the very best quality, perfectly tubular or pipular. All acid proof pipe is to be made of acid proof metal. All pipe is to be supplied with nothing in the hole so that water, steam, or other stuff can be put in the pipe at a later date. All pipe is to be supplied without rust as this can be more readily supplied at the job-site. All pipe is to be cleaned free of any covering such as mud, tar, barnacles, or any form of manure before putting up, otherwise it will make lumps under the paint.