All pipe is to be made of a long hole, surrounded by metal concentric to the hole.
All pipe is to be hollow throughout the entire length.
All pipe is to be of very best quality, perfectly tubular or pipular. All pipe is to be supplied without rust, as this can be more readily put on at the job site. All pipe closers are to be open on one end. All pipe fittings are to be made of the same stuff as pipe. No fittings are to be put on pipe unless specified.