In one embodiment, a valve is secured to a distribution conduit in fluid communication with {HEAD ~ a pressurized source} of {TAIL ~ fluid} 
In one embodiment , a valve is secured to a distribution conduit in fluid communication with { HEAD ~ a pressurized source } of { TAIL ~ fluid }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL