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