74:02:09:10Inspection port.
Section · Administrative Rules of South Dakota · View on sdlegislature.gov ↗
The inspection port shall be located on the pipeline between the irrigation pump and the irrigation pipeline check valve, as illustrated in Appendix A at the end of the chapter. The vacuum relief valve connection may serve as the inspection port. The inspection port or viewing device shall be situated in such a manner that the inlet to the low-pressure drain can be observed. A minimum four-inch orifice or viewing area is required.
Source: 15 SDR 81, 15 SDR 84, effective November 27, 1988.