Drain size

[ryandebny]

What is the proper size for the shower drain? And what is the proper size for Kitchen sink?
Bathroom sink?

[pushkins]

I assume you the drain size request you mean the actual PVC pipes.

The shower drain should be 2" and the kitchen sink should be 1 1/2", the vanity sink can be either 1 1/4" or 1 1/2. ( 1 1/2" is the better option).

[LazyPup]

2" is the correct size for the shower drain however the sink drain line would depend upon which code you are under.

Under the IRC (International Residential Code) a kitchen sink requires an 1-1/2" drain line.

Under the UPC (Uniform Plumbing Code) a kitchen sink waste arm (the section extending out of the wall) should be 1-1/2" but all concealed piping in the wall must be 2".