SMC Stuff

ok, today we got our SMC stuff. i noticed that the solenoids were not assembled. i managed to put them together with relative difficulty, but as i put them together, i noticed that they were different from last year’s. there was a few more air ports (labeled ‘X’ and ‘PE’), or at least i didn’t notice them last year. can anyone enlighten me on these new air ports?

i believe There are ports labeled EA and EB and those are the exhaust ports.