I have a single sink in my bathroom at this point, am trying to put a double sink counter top on it. My question is if I have to put a double drain pipes or if I can put a T on the excisting one, same question for the hot, and cold water. Am just worried about the drain pipe hopefully you guys can answer my questions thank you very much guys.

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my question is if i have to put a double drain pipes or if i can put a T on the excisting one, same question for the hot, and cold water

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You may connect the two tubs to one trap using a continuous waste,(see image). As for the water, simply swap your present angle stops for 1/2X1/4X1/4" angle stops,(see image) and pipe both supplies from there. To change out the stops, shut the water off and remove the old stops. Leave the 1/2" compression nut and ferrule and install the new angle stops using the old nuts. Simple, Huh? Good luck, Tom