Abstract: A connecting structure including a press-fitting body 341 of a press-fitting member 34 is press-fitted into one end of a resin tube 1 to thereby form a diameter-enlarged end portion 1a at one end of the resin tube 1 and fixedly engage an axially-inner end portion of the diameter-enlarged end portion with inner circumferential surface of a base portion 271 of a connection member 27. A sealing member 71 is fitted into an annular outer circumferential groove formed in the outer circumference of the diameter-enlarged end portion. An end portion 551 of a mating member 55 is fitted onto or inserted into the diameter-enlarged end portion, so that the end portion 551 engages the outer circumference of the sealing member in a fluid-tight condition. Upon insertion or fitting of the end portion of the mating member, a second engagement portion 552 projecting radially outward from the outer circumferential surface of the end portion 551 of the mating member 55 engages arm portions 272 of the connection member.

Abstract: Tube 1 is comprised with an engaging end portion 11 formed on one end thereof and an annular concave portion 1b formed on the engaging end portion at a position remote from the end surface in the axial direction; an elastic sealing member 2 is comprised with an inner tube 21, which has an outer peripheral surface to be fitted to an inner peripheral surface 13 of the tube, and an outer tube portion 22, which is provided at one end side of the inner tube portion that is bent outwardly over as to cover one end surface of the engaging end portion while covering the outer peripheral surface of the engaging end portion 11; and an elastic sealing member 2, which comprises an annular concave portion 2b formed on the inner peripheral surface of the inner tube portion and an annular protrusion 2a matching the annular concave portion 1b of the tube formed on the outer peripheral surface, is inserted into the tube.

Abstract: A fuel hose (10) has a straight insertion end portion (10a) at one axial end thereof and includes an outer layer (11) formed of a cylindrical elastic rubber body and having a groove portion (12) formed coaxially on the inner wall at an axially inward end of the insertion end portion (10a); a thin-walled inner layer (18) made of a resin material of low gasoline permeability and fixedly bonded to the entirety of a portion of the inner wall of the outer layer, the portion including at least the groove portion and extending axially inward from the groove portion; and an annular seal member (19) fitted tightly into the groove portion lined with the inner layer. A mating pipe (21) having an engagement protrusion (22) formed at an end portion thereof is inserted under pressure into the insertion end portion of the outer layer such that the engagement protrusion presses the seal member fitted into the groove portion to thereby be engaged with the groove portion in a fluid-tight condition.

Abstract: A cylindrical elastomeric sleeve 50 is attached to and held in a receive end portion of a tubular female member 40 made of a resin or a metal. When a tubular male member 30 is inserted, an annular projecting portion 31 of the male member 30 is engaged with an engagement inner peripheral groove 56 while a diameter of a swelling portion 53 of the elastomeric sleeve 50 is increased in a first diameter portion 41 of the female member 40. A portion between the male member 30 and the female member 40 is sealed by a seal portion 54 at the other end side of the elastomeric sleeve 50 received in a second diameter portion 43 of the female member 40.