An apparatus 1, wherein {HEAD ~ the base} has an internal chamber and {TAIL ~ an inlet port} for receiving pressurized gas or fluid into the internal chamber such that the stems are biased toward their extended positions by the pressurized gas or fluid 
has
An apparatus 1 , wherein { HEAD ~ the base } has an internal chamber and { TAIL ~ an inlet port } for receiving pressurized gas or fluid into the internal chamber such that the stems are biased toward their extended positions by the pressurized gas or fluid
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH TAIL 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