Tube connectable to pipe

A tube to be connected to a pipe having an insertion portion and a projecting portion extending radially outwardly from an outer circumference of the pipe, said tube comprising:

• a base portion for receiving therein the insertion portion of the pipe, said base portion having a smooth inner surface extending in an axial direction for a predetermined distance to contact the insertion portion of the pipe,
• a wide portion integrally formed with the base portion at one side thereof, said wide portion having an inner end extending radially outwardly from the base portion, an opening formed at a side opposite to the inner end and an inner diameter greater than that of the base portion, said wide portion receiving the projecting portion of the pipe therein when the pipe is inserted,
• a narrow portion integrally formed with the wide portion to project inwardly from an inner circumference of the wide portion and located at a position away from the inner end, the thickness of the tube for forming the narrow portion being substantially same as that of the wide portion, said narrow portion being deformable and having a plurality of inward projections disposed side by side in a circumferential direction with a space between two of the inward projections, said inward Projections being formed between the inner end and the opening so that the narrower portion allows the projecting portion to pass therethrough in a pipe inserting direction by deformation thereof, and prevents the projecting portion from passing therethrough in a pipe removing direction opposite to the pipe inserting direction, and
• an O-ring situated adjacent to the inner end to seal the tube relative to the pipe.