I would glue and clamp everything that you can glue or clamp. While technically it should be low pressure after the pump so it should not need glue. All it would take is one clog or an inadvertent movement of the pipe to open a joint and let the sewage come out all over the lawn or wherever.
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2001 Suburban 4x4. 6.0L, 4.10 3/4 ton **** 2005 Jayco Jay Flight 27BH **** 1986 Coleman Columbia Popup