seat-filler 含义

垫片 4″CL900.RF.4.5mm.SP WD SS 304L304L AND FILLER FLEX GRAPHITE W/LOR SS 304L啥意思?
哪位给翻译下,这是什么形式的垫片,

求大神翻译 “filler” sound that we use for most of our
求大神翻译
“filler” sound that we use for most of our unaccented syllables
填充音 什么意思.希望大神能给我讲明白

英语翻译
wefa protect 2k wdl
wefapox 2k w filler beige
wefapox 2k w metal primer

英语翻译
The date that is available to you is just a filler date by which you will be advised through alternative means,specifically e-mail.
Once you book that date,you should be receiving an e-mail regarding your alternate enrolment.Please read it carefully and follow all the instructions which will help your enrolment process be a smooth transition.
The appointment time you cite is a special date we put aside for students who live outside of southern Ontario.You do not have to come to campus on that day.We will be in touch with you via email closer to the date and will instruct you on how to enrol in courses via the internet.
If you are not planning to be in Canada until late in the summer,please book the May 27 appointment slot.Once you book that date,we will email instructions on how to enrol in courses.