The outer surface 58 has a first circumferentially extending groove 64 which is slightly below the level of the lip 62 and accommodates a first annular ring seal 66 and a second circumferentially extending groove 68 near to {HEAD ~ the bottom} of {TAIL ~ the sleeve} which accommodates a second annular ring seal 70 
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The outer surface 58 has a first circumferentially extending groove 64 which is slightly below the level of the lip 62 and accommodates a first annular ring seal 66 and a second circumferentially extending groove 68 near to { HEAD ~ the bottom } of { TAIL ~ the sleeve } which accommodates a second annular ring seal 70
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