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".
hello, sorry my english not perfect. my toilet in apartment is making noise ALL THE TIME, like running water sound, even when nobody use it. is this normal...
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