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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1. Locate your compost tumbler in a shady spot (see References 1), then choose your location based on convenience. Some gardeners place their compost tumblers close to the garden where they plan to use the compost, allowing them to move the finished compost directly from the tumbler to the garden.