In various arrangements, the threaded collar is sized for threaded engagement with an inlet or outlet of the storage tank, {HEAD ~ a drain opening} of the tank, or {TAIL ~ a pressure relief valve} of the tank 
In various arrangements , the threaded collar is sized for threaded engagement with an inlet or outlet of the storage tank , { HEAD ~ a drain opening } of the tank , or { TAIL ~ a pressure relief valve } of the tank
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH