There’s a halakha (Jewish law) that says a keli (vessel) and a Netilat Yadayim (ritual hand-washing) have to have a unified circle at the top. But if you have a pitcher with a spout, then it wouldn’t be a good keli and a Netilat Yadayim, especially for pouring from there. The source for this halakha is the Shelah HaKadosh, which is pretty recent, talking about 250 years, nothing before that. He says the following: “We cannot do a Netilat Yadayim from a jug, from a container that has a spout that is protruding.” Why? Because that part is only for pouring; it’s not also for receiving. Normally, a petach is something that receives and also could expel, could flow the water from there. It’s for both, for coming in and for coming out. Here, you don’t pour the water into the jug through that spout, and therefore that spout is not considered part of the petach in a normal way. I’m trying to explain in my own words what the Shelah is saying.
Believe it or not, although everybody thinks that that’s halakha, most poskim (halachic authorities) disagree with the Shelah HaKadosh. The easiest reason to understand is that the kiyor (basin) in the Bet HaMikdash, which is the source where the Kohanim (priests) used to do the Netilat Yadayim and the Raglayim (feet), was done like that. There were actually spouts coming out; it would add water, and it would come out from there. This is the source. This is the source. This is the source. This is the source. How could you say that it doesn’t work? This is a very strong question. Of course, there’s some debate over there about how the Shelah HaKadosh would answer. But just to quote one of the poskim: the Machatzit HaShekel, Aruch HaShulchan, and all the poskim say, “Lo mibaya she'afilu derech ha-peh ha-elyon mutar litol” (Needless to say, even through the upper opening, it is permitted to wash). There’s no problem doing Netilat Yadayim with such a keli, and even using the spout itself to do Netilat Yadayim would work.