Multiple squid proxies on one server

I'm trying to set up a squid proxy server that listens on two ports - each forwrarding to a different cache_peer. Is that possible? Something like...

http_port 192.168.0.1:80 name=80
http_port 192.168.0.1:81 name=81

cache_peer proxy1.domain.local parent 80 0 default (for name=80)
cache_peer proxy2.domain.local parent 80 0 default (for name=81)

All other settings are universal including acl's and bypass_parent.

acl localnet src 192.168.0.0/24
acl bypass_parent dstdom_regex "/etc/squid/bypass_parent.txt"
always_direct allow bypass_parent
never_direct allow all