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I have propane service and I'm going to replace all my lines after the secondary regulator. My question is the outlet on the regulator is 1/2 inch with an elbow that expands to 3/4, let's say my calculations required a 1 inch pipe from the regulator on, wouldn't this create a bottleneck at the...

I have a 3" main drain will be running directly to effluent pump in basement. At the end will be a 4x3in closest flange. Before the toilet it branches off to the shower 2" trap arm and 2" shower vent about two feet downstream of toilet. Do I need a separate vent for toilet or will the shower...