1 Between the intersection with the sink's drain pipe and the toilet's waste pipe, the vent pipe is acting as the sink's drain and the toilet's vent, and so must be 2 in diameter. 2  Above the intersection with the sink, the vent pipe simply acts as a vent for both fixtures and so can be smaller, 1.5 in diameter.reate a dry vent by attaching a ventilation pipe to a fixture's drain pipe. Depending on the fixture, the vent pipe can be fairly small but should be positioned within a couple feet of the fixture. Make sure to check your local building codes for specific regulations about sizes and distances for your vent pipe.
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Place a container under the tumbler when the compost is uniformly brown, crumbly and earth-like. Rotate it so that the door is facing down, open the door and let the compost fall into your storage container so you can transport it to wherever you intend to use it.