The present application discloses methods and apparatus for installing fitting components, such as a conduit gripping device, on a conduit to form an assembly. The assembly is joinable with at least one other fitting component to form a fitting. The present application also discloses methods and apparatus for evaluating characteristics of components of a mechanically attached connection. Characteristics that may be evaluated include, but are not limited to, the position of a conduit gripping device on a conduit, an amount of axial compression or stroke of the conduit gripping device, an amount of clamping force applied to the conduit gripping device as the conduit gripping device is compressed, and an amount of torque applied to members that compresses the conduit gripping device.

A pipe fitting can include an inlet, an outlet, a passageway along an axis between the inlet and the outlet, and a gasket. The inlet includes an inner wall at the passageway, an outer wall outward from the inner wall relative to the axis, and a groove between the inner wall and the outer wall. The gasket includes a head and a collar extending from the head, the gasket sized to be received in the groove such that the head is inside the groove and the collar is outside the groove.

A pipe fitting can include an inlet, an outlet, a passageway along an axis between the inlet and the outlet, and a gasket. The inlet includes an inner wall at the passageway, an outer wall outward from the inner wall relative to the axis, and a groove between the inner wall and the outer wall. The gasket includes a head and a collar extending from the head, the gasket sized to be received in the groove such that the head is inside the groove and the collar is outside the groove.

In an embodiment, a receptacle for hydrogen charging of a fuel cell vehicle capable of reliably maintaining seal with a charging nozzle during rapid hydrogen charging, wherein the receptacle includes a body including a nozzle insertion portion configured for a nozzle tip of the charging nozzle to be inserted therein, a filter space portion having installed therein a filter, and a passage space portion provided between the nozzle insertion portion and the filter space portion; and a sealing device having a spring and seal member, configured to seal between a tip end portion of the nozzle tip and an inner side surface of an extended space portion by being installed in the extended space portion extended in a radial direction centered on the tip end portion of the nozzle tip which has passed through the nozzle insertion portion and entered the passage space portion.

In an embodiment, a receptacle for hydrogen charging of a fuel cell vehicle capable of reliably maintaining seal with a charging nozzle during rapid hydrogen charging, wherein the receptacle includes a body including a nozzle insertion portion configured for a nozzle tip of the charging nozzle to be inserted therein, a filter space portion having installed therein a filter, and a passage space portion provided between the nozzle insertion portion and the filter space portion; and a sealing device having a spring and seal member, configured to seal between a tip end portion of the nozzle tip and an inner side surface of an extended space portion by being installed in the extended space portion extended in a radial direction centered on the tip end portion of the nozzle tip which has passed through the nozzle insertion portion and entered the passage space portion.