can someone explain to me what is schwing's big rock valve?

Its just a long version of the rock valve, supposed to take harsher mixes.

Normally Speedy will always beat me to the punch but this time i gave him the smack down.

Ok here is a good link to look at concerning this. It compares the two.

http://www.schwing.com/01_cpumps/tech/rock.html

is it harder to clean then the standard rock?

what about blockfill mixes?

I love the e rock just longer i think it keeps the hopper cleaner and pumps everything.

and to think I only remember short rock,long rock,e-rock.My how time flies.