No, but using it makes for a better installation in my opinion.
That ring is suppose to fit between sink and vanity top to add some stability.
This will work just great. I have a granite top and it fits great no leaks
This products does not have overflow. There is a similar product that is the same except has the overflow.
The length is long enough for any vanity. I have a wooden vanity with a thick granite top and my vessel sink is a thick glass. I was concerned that this would not fit. However it does and it comes with everything needed. The sink ring does have a washer. I now have no leak or rust. My 22 year old son was able to install this with no problems. Quality material. I don't think I will have to replace this unless I change the style of my vanity.
yes, I believe this popup is made for vessel sinks
The width of the stem is 1 1/4".
You need the mounting ring if you have a vessel sink. This is what the sink sits on , on top of your counter and seals everything up. This drain is designed for use without an overflow
No this is only for a vessel sink. The mounting rig that is.