1.1 This specification covers flexible leak resistant joints for concrete gravity flow sewer pipe using rubber gaskets for sealing the joints, where measurable or defined infiltration or exfiltration is a factor of the design. The specif This specification covers flexible leak resistant joints for concrete gravity flow sewer pipes using rubber gaskets for sealing the joints, where measurable or defined infiltration or exfiltration is a factor of the design. The gasket shall be fabricat