Described herein are {TAIL ~ end caps} which, as well as being connectible to the ends of the canisters, have recesses so that the end caps, having been removed from the canisters, can do double duty engaged between the sides of the canisters to support and space the canisters in {HEAD ~ a stack formation} 
Described herein are { TAIL ~ end caps } which , as well as being connectible to the ends of the canisters , have recesses so that the end caps , having been removed from the canisters , can do double duty engaged between the sides of the canisters to support and space the canisters in { HEAD ~ a stack formation }
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL 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 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