Yes, they have all the psi ratings on both Andymark.com aand Bimba.com.
I found the standard Pneumatic tubing on AndyMark.
http://www.andymark.com/product-p/am-2028.htm
If you are leaning more towards pistons and that sort of thing then Bimba is more your way.
-- Hope This Helps,
Brendan