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  • A-4 ~Spool Type Rubber Expansion Joint

    A-4 ~Spool Type Rubber Expansion Joint

    The spool type rubber joint is molded type, with a metal collar reinforced at the neck of the body. The ST stype uses a light reaining ring to support the integral flange. STF is filled arch, with 50% of the ST allowed movements, but it has 4 times spring rates than hollow arch.
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