The bladder comprises corners extending outward from both metal clamped end portions having the openings, first oblique portions curved and extending outward from the corners, second oblique portions extending outward from the first oblique portions, and a convex portion curved and extending outward from the second oblique portions to the maximum diameter cross section of the bladder to couple {HEAD ~ the upper and lower halves} of {TAIL ~ the bladder} to each other 
The bladder comprises corners extending outward from both metal clamped end portions having the openings , first oblique portions curved and extending outward from the corners , second oblique portions extending outward from the first oblique portions , and a convex portion curved and extending outward from the second oblique portions to the maximum diameter cross section of the bladder to couple { HEAD ~ the upper and lower halves } of { TAIL ~ the bladder } to each other
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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH