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 Lip of rubber gasket inclined toward inside presses pipes after tightening bolts even when there is no pressure inside pipes.

 When inner pressure is generated, pressure at sealing hole also increases through lip’s fluid pathway, and this compresses pipes tighter.

 Grip type holds pipes tightly with double grip (serrated grip and plain grip at both each side)

 Slip(flexible) type allows contraction and expansion of pipes.

 

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