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An MDPE backing
band may be applied (for pressurised pipes only) to the prepared joint
to protect the rubber seal from compression damage. The one piece EPDM or NBR seal is positioned
over the joint (or backing band) and held in place
whilst the first stainless retaining ring
is loosely fitted in position. The second
stainless steel ring is fitted into place
and then both rings are hydraulically expanded
and secured with stainless steel
retaining wedges.
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