Section 192.375 - Service lines: Plastic(a) Each plastic service line outside a building must be installed below ground level, except that- (1) It may be installed in accordance with § 192.321(g) ; and(2) It may terminate above ground level and outside the building, if- (i) The above ground level part of the plastic service line is protected against deterioration and external damage;(ii) The plastic service line is not used to support external loads; and(iii) The riser portion of the service line meets the design requirements of § 192.204 .(b) Each plastic service line inside a building must be protected against external damage.35 FR 13257, Aug. 19, 1970, as amended by Amdt. 192-78, 61 FR 28785, June 6, 1996; Amdt. 192-124, 83 FR 58719 , Nov. 20, 2018