The HLT tap isn't connected yet ( I may replace it for a WD heatproof tap) but the idea is to use a quick connect system so that the single pump can also be used to pump the sparge water. All flow can be regulated using the white tap on the pump outflow.
http://www.willmottw.fsnet.co.uk/brew/HERMS/
HE is using 25m of 8mm microbore
Matt