Section 6-77-66 - Design pressure of plastic fittings(a) Thermosetting fittings for plastic pipe must conform to ASTM D 2517.(b) Thermoplastic fittings for plastic pipe must conform to ASTM D 2513.[Eff ] (Auth: HRS § 269-6) (Imp: 49 C.F.R. §192.191, OCT 1, 1990)