11.   These include the tubulum, which is similar to the PVC, but has longer pipes and is struck with sticks.

12.   They are permitted only in areas of the city with modern sewer systems that have separate pipes for storm runoff and household waste.

13.   But he said few buildings or plants have pipes as long as the half-mile that creator Schempf said is needed to make the robot profitable.

14.   Gas company officials said they hoped to have the pipe plugged and ready for repair Saturday.