2. All pipe is to be hollow throughout it's entire length. Do not use holes of different length than the pipe.

3. The I.D. (Inside diameter) of the pipe must not exceed the O.D. (Outside diameter) otherwise the hole will be on the outside.

4. All pipe to be supplied with nothing in the hole so that water, steam and other stuff can put inside at a later date.

5. All pipe should be supplied without rust as this can be more readily applied at the job site.

6.All pipe over 500ft (153 M) in length should have the words long pipe painted in the middle so the contractor will not have walk entire length of the pipe to determine it is a long pipe or short pipe.

7. All pipe over 6" in diameter must have the words "Large Pipe" painted on it so the contractor will not mistake it for a small pipe.

8. Flanges must be used on all pipes. Flanges must have holes for the bolts quite separate from the big hole in the middle.

9. When ordering 90 degree, 45 degree or 30 degree elbows , be sure to specify left or right hand otherwise you might end up going the wrong way.

10. Be sure to specify whether you want level, uphill or downhill pipe. If you use downhill pipe for going uphill, the water will
flow the wrong way.