Principal water pipes (5)
I believe the answer is:
mains
(Other definitions for mains that I've seen before include "seen in cockpit" , "Distribution network" , "Water, gas or electricity supply" , "source of power" , "current public source" .)
I believe the answer is:
mains
(Other definitions for mains that I've seen before include "seen in cockpit" , "Distribution network" , "Water, gas or electricity supply" , "source of power" , "current public source" .)