(a) Inaccessible water distribution piping under concrete slabs may be cross-linked polyethylene PEX (SDR9) pipe.
(b) Cross-linked polyethylene PEX (SDR9) pipe shall meet ASTM F-876/F-877 and NSP standards 14 and 61.
Water distribution piping under concrete slabs
Ark. Code Ann. § 17-38-106 — under Plumbers.
Ark. Code Ann. § 17-38-106