Patent ID: 7384074

Claim:
A press-fitting, comprising: a body ( 21 ) having a core portion and having an annular groove ( 213 ) on the rear end of the core portion; a jacket ( 22 ); a seal ring ( 23 ); a plastic check ring ( 24 ) having a limit annular convex portion ( 242 ) that snaps into the annular groove ( 213 ); wherein: said plastic check ring ( 24 ) is provided with an annular convex portion ( 241 ) and an inner hook ( 243 ) extending towards the annular convex portion ( 241 ); one end of said jacket ( 22 ) has an inward wall ( 221 ) for clamping with the inner hook ( 243 ); said body ( 21 ) has a seal groove ( 211 ) and a serrated groove ( 212 ) with fillets on its core portion; said seal ring ( 23 ) is disposed in said seal groove ( 211 ) with the outer diameter of the seal ring ( 23 ) being smaller than or equal to the outer diameter of the core portion.