In N. America, bathroom sink drain and p-trap are usually 1.5 inch inside diameter.
Some places allow for 11/4 - 11/2 basin trap.Normally you will find a 11/4 INLET and 11/2 outlet
Tub waste is 11/2" toilets 3" - 4"
Showers 2"
Bidget 1/12
Most times a bath / lavatory sink will stop water flow because of hair that accumulates in the trap of the drain ,The trap is the upside"S"underneath the sink ...Try using liquid plumber foaming pipe snake that you can buy at your favorite grocery store.
The drain in the bathroom sink is 1 1/4 inch. However, the trap or the fitting on the wall may be 1 1/2 or 1 1/4 inch.
An S trap is a length of water plumbing pipe used under sinks. The pipe is shaped like an S and prevents the pipe from becoming air locked. An air locked pipe cannot drain.
No and yes. Amendment (not from a professional plumber!): If you were simply running the sink drain into the shower drain and if there was not a reduction in pipe size, I would think you would be able to do that. I think the reason you need a trap for the sink has to do with code that requires a trap be no more than 24" from the basin to the trap arm. That being said, the pedestal sink in my house does not have a trap until after it drains below the floor.
you must cut the pipe, and use a coupling meant for that size of pipe(its usually 1'1/2") to repair it, you will need the "rain or shine" cement(glue) to attach the coupling to the to ends of pipe. You could also use the purple primer and a heavy duty cement but the rain or shine is all in one. All this is available at any home improvement store
Yes, if they are the proper size to mate, or match up. yes
A buzzing sound could be created from debris in the drain pipe. Try removing the P trap and clearing out any junk you find.
If it's a sink drain , best to remove the entire pipe and P trap. I then take outside and hose them out.
No
Shower drain goes into a trap under shower. Continue piping from trap to drain line.
no, in fact most plumbing codes require a 2" drain/trap for washing maching drain.
trap with a cleanout plug
It doesn't. A grease trap collects grease, a pipe just conveys it there.
As long as the pipe going into the wall is straight, the rest of the drain pipe can be routed however it needs to be. Very often the trap is at an angle to the pipe in the wall.
Most times a bath / lavatory sink will stop water flow because of hair that accumulates in the trap of the drain ,The trap is the upside"S"underneath the sink ...Try using liquid plumber foaming pipe snake that you can buy at your favorite grocery store.
The drain in the bathroom sink is 1 1/4 inch. However, the trap or the fitting on the wall may be 1 1/2 or 1 1/4 inch.
The trap is built into the toilet itself, you shouldn't put one in the drain.