This is my first post here and I would like to thank everyone for their help in advance. I just picked up a pair of SE425's and I was just wondering if the nozzle is supposed to have the white plastic (maybe filter) in the middle of the nozzle. I had the SE315's and they came with the part in the nozzle. My current ones do not have it. I am wondering if there is an issue with the unit or if that is just normal for the SE425. I appreciate any help!