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PC § 1302.4
On-site nonpotable water reuse systems shall utilize drainage piping approved for use in plumbing drainage systems to collect and convey untreated water for reuse. Vent piping approved for use in plumbing venting systems shall be utilized for vents in the nonpotable system. Collection and vent piping materials shall comply with Section 702, Table 702.1 and Table 702.2.
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