How do you connect a drain line to a bathroom sink drain?

Also, what size is bathroom sink drain pipe?

While a bathroom sink's design and overall size may vary from one model to the next, the drain holes are fairly standard, 1.25 inches being a general standard, with widths of 1.5 inches and 1.625 inches also common. The size of the hole helps determine which size drain is needed for that particular sink.

Similarly, how do you attach a P trap to a drain pipe? How to Install the P-Trap under a Sink

1. Slide the short side of the P-trap onto the tailpiece that drops down from the sink drain.
2. Take the lower part of the P-trap apart and insert the trap arm into the wall drain fitting as far as it will go.
3. Pull the trap arm out of the wall fitting until it lines up with the top U-shaped portion of the trap.

Also to know is, can I drain a sink into a floor drain?

A sink needs to be connected to your sanitary sewer. The floor drain will be connected to your storm sewer. If you are in an older home, where they are shared, you could do it, but you will have to excavate the floor and make the connection sub-slab with rigid connections and not flexible hose or pipe.

Why is my bathroom sink not draining?

Slow-moving or stopped-up drains are common in bathroom sinks, but luckily the fix is usually simple and takes only about 15 minutes. The problem is caused by hair and gummy soap scum that get caught on the stopper or pivot rod and clogs the drain.