A retaining ring surrounds the vessel and the seal cover at the position where the vessel and the seal cover meet to maintain an outer circumferential engagement between {TAIL ~ the seal cover} and the vessel when pressure forces {HEAD ~ gases} in the vessel to flow into the circumferential passage and then outwardly from the pressure release opening 
A retaining ring surrounds the vessel and the seal cover at the position where the vessel and the seal cover meet to maintain an outer circumferential engagement between { TAIL ~ the seal cover } and the vessel when pressure forces { HEAD ~ gases } in the vessel to flow into the circumferential passage and then outwardly from the pressure release opening
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