my cottage has a shower, toilet and two sinks emptying into a septic tank. But the cottage doesn't have any venting in the plumbing.
i want to know what the rules are for installing a vent system: one for each item or after they tie into the main drain?
thanks for the help
The simple rule that EVERY trap requires a vent between the trap and the drain connection, and before it turns downward. BUT that could mean many vents or just one depending on how the fixtures and piping are arranged.