Is the O shaped Uvtuvo Washing Cup kosher for Netilat Yadayim according to all opinions? If not, what are the sources and issues so one can make an informed decision? Thanks!
If you don't mind, I'd rather stick with the good old two-handled washing cups made of plastic that you can pick up from a Judaica joint for $3 or so... Not only is it much cheaper but it's also better according to all opinions.– ezraJul 21, 2018 at 0:23
Welcome to Mi Yodeya! Please take a look at our tour where you can find some useful information about the site. What makes you think that there are potential problems with washing cups that you ask this?– DonielFJul 22, 2018 at 4:01
1It would be great if your question was self-standing, and wouldn't require the use of Google to see what cup you are speaking about. Would you mind adding an image by editing your question?– mblochJul 22, 2018 at 18:14
If you have a "cup" that has a hole in it that leaks water, you may only pour out water to wash your hands from that hole [if its possible to pour from there]. Any part of the cup above the hole, is not considered a kosher utensil for washing. [See Shulchan Aruch A"H 159/2]
In your case, when the cup is standing on it's base, the water will only go up to a certain point. Anything above that point would not be considered a kli - utensil. Therefore, if the water you are washing your hands with, is coming above the top, it would not be an acceptable washing. I would think it is difficult to be careful about this, and not advisable to use for washing on a regular basis.