Well, there are a couple of vacuum hoses in my FD that look like they need to be Changed and after searching ive found out that the debate between silicone and viton seems preatty even, so iam going to go with silicone. My question lies in the fact that people say in some threads that the size that i need is 4mm but in some other threads it says there are different sizes. So what sizes do i need and is there one size i can use for all the hoses? Also, if there are different sizes, which hoses require the different sizes?

Thank you.

 

4mm & 6mm

http://www.bakerprecision.com/hosetech.htm

You'll use a lot more 4mm.

 

thanks!