An assembly configured to be press joined with a pipe by a pressing tool includes a piping component, which includes a body, a first end having a rim and an inner surface having a plurality of grooves, and a sealing recess wall positioned between the first end and the body and defining a sealing recess. The assembly also includes a sealing element received within the sealing recess of the piping component and having a sealing element thickness. The sealing element thickness of the sealing element is about equal to and not less than a Minimum Sealing Element Thickness Value of the sealing element.

An assembly configured to be press joined with a pipe by a pressing tool includes a piping component, which includes a body, a first end having a rim and an inner surface having a plurality of grooves, and a sealing recess wall positioned between the first end and the body and defining a sealing recess. The assembly also includes a sealing element received within the sealing recess of the piping component and having a sealing element thickness. The sealing element thickness of the sealing element is about equal to and not less than a Minimum Sealing Element Thickness Value of the sealing element.

An assembly configured to be press joined with a pipe by a pressing tool includes a piping component, which includes a body, a first end having a rim and an inner surface having a plurality of grooves, and a sealing recess wall positioned between the first end and the body and defining a sealing recess. The assembly also includes a sealing element received within the sealing recess of the piping component and having a sealing element thickness. The sealing element thickness of the sealing element is about equal to and not less than a Minimum Sealing Element Thickness Value of the sealing element.

A tube-attached coupling structure is provided by using a piping coupling with good compatibility, workability and processability. A manufacturing method of the tube-attached coupling structure includes a step of preparing a photocurable gel-like body in a hollow cylindrical shape, a step of fitting the photocurable gel-like body in the attaching hole, a step of inserting an end portion of a connection tube into a hollow hole of the photocurable gel-like body, and a step of curing the photocurable gel-like body by irradiating the photocurable gel-like body with light.