Jlong Posted March 26, 2020 Report Share Posted March 26, 2020 I’m rerouting plumbing from upstairs and will have isolated 6 foot horizontal run of septic lift liquid. Currently feeds into 4 inch line that has upstream feed from frequently used fixtures. Question is do I maintain 4 inch line or can I run 2 inch for that segment. Basement used few times a year. Quote Link to comment Share on other sites More sharing options...
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