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Does it matter what order the bathroom fixtures are plumbed in to assure proper venting? The bathroom is laid out from left to right with the tub, then toilet, then vanity, with the tank being...

Speedball1,

The capped pipe is from the existing house vent. The holding tank has a separate vent as you mentioned.

The sink (vanity) will tie in to the house vent. Does the tub also need to...

I am finishing my basement. It has roughed-in plumbing under the slab for a bathtub, sink and toilet tied to pit for a sewage ejector pump to pump up to the municipal sewer. There is a 2" capped...