Abstract: A press-fitting includes a body, a jacket, a seal ring and a plastic check ring. The plastic check ring has an annular convex portion, one end of the jacket has an inward wall for clamping with the inner hook, the body has a seal groove and a serrated groove with fillets on its core portion. The seal ring is disposed in the seal groove with the outer diameter of the seal ring being smaller than or equal to the outer diameter of the core portion. The press-fitting according to the present invention is of simple structure, and is convenient and quick to be assembled, and can be inspected, and is safe on seal coupling.

Abstract: A press-fitting, comprising a body (21) having an annular groove (213) on the rear end of its core portion, a jacket (22), a seal ring (23) and a plastic check ring (24) having a limit annular convex portion (242) that is fit to 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 with fillets (212) 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. The press-fitting according to the present invention is of simple structure, and is convenient and quick to be assembled, and can be inspected, and is safe on seal coupling.