In embodiments of the present invention including a pressure activation assembly, {HEAD ~ the outer housing} is formed by {TAIL ~ a pair} of covers having a degree of flexibility and elasticity 
is formed by
In embodiments of the present invention including a pressure activation assembly , { HEAD ~ the outer housing } is formed by { TAIL ~ a pair } of covers having a degree of flexibility and elasticity
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH