SDCL § 32-18-24: Check valve required on air or vacuum reservoirs--Violation as misdemeanor.

All motor vehicles, trailers, semitrailers, and pole trailers, when equipped with air or vacuum reservoirs or reserve capacity as required by § 32-18-19 or 32-18-21, shall have such reservoirs or reserve capacity so safeguarded by a check valve or equivalent device that in the event of failure or leakage in its connection to the source of compressed air or vacuum, the stored air or vacuum may not be depleted by the leak or failure. A violation of this section is a Class 2 misdemeanor.