I installed a new toilet fill valve a few months back, it came with a plastic tube to connect to the tiny hole and I figured that's how it must fill. Looking at my other toilet after it had a problem, no water comes from the hole at the top at all and there's no plastic tube there. So I feel maybe this one is faulty somehow, even though it seem to do the job?? I'll attach a pic of the tube it's coming from. Fingers pointing at it. Thanks in advance.