Sink Drain Pipe Size Code

The last size is 4 inch drain pipe that can be connected to 160 units in horizontal stack and 240 units in vertical stack.

Sink drain pipe size code.

Tables of plumbing drain pipe vent pipe sizes critical distances to plumbing fixtures. Compare the fixture to the minimum sizes of drainage pipe by fixture table. To be safe install more supports than are required. The horizontal pipes connect to the trap with a double wye tee which has two y shaped inlets and one outlet.

All the pipes that connect to the tailpiece including the p trap assembly. For instance the minimum pipe diameter for a washing machine drain is pipe with a 1 1 2 inch diameter. This is the minimum size to use for building sewer or drain pipe that is connected to the toilet. Some older sinks may have drains that connect to a 1 1 4 inch tailpiece but most modern drains have a 1 1 2 inch outlet.

This pipe size is commonly used for sanitary drainage. A single trap can service more than one sink but adjacent drains cannot be farther apart than 30 inches. You ll see these distances also in our sketch at left. Bathroom vanity with cooper sink.