@SuperJohn(View Post) STOR only stores elements of its own ctype. If you connect STOR to PIPE, the STOR automatically passes whatever it is storing to the pipe. So if you have some STOR(OIL) next to some PIPE, the STOR will send the OIL, and only OIL, into the PIPE.
PIPE doesn't have any room to store this information. You'll have to do the STOR->PIPE way suggested by QuanTech. STOR is able to use ctype for this because it doesn't need to store all of the information PIPE does.