{TAIL ~ The system} effectively seals {HEAD ~ the active agent chamber} and isolates it from the environment of use 
{ TAIL ~ The system } effectively seals { HEAD ~ the active agent chamber } and isolates it from the environment of use
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH