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. If you do, straight pipe becomes crooked pipe. Be sure to specify the direction you are going when ordering. All flanges must be cast or forged of very best quality iron metal, close grained, free from blow holes, lumps, cavities, pock marks, pin pricks, and warts, otherwise we can't use them. Gaskets are to be used to fill space between flanges.