The intention relates to a closure (1) for sealing of a neck finish (2) of a liquid container comprising a top deck (3) and an outer skirt (4) extending from the top deck (3) in an axial direction (z) away from the top deck (3) comprising at least one locking means (5) for engaging the closure (1) to the neck finish (2) of the liquid container. A with respect to the top deck (2) deformable primary sealing lip (6) is arranged on an inner surface (7) of the top deck (3) and extends in a circumferential manner along the inner surface (7) of the top deck (3). The primary sealing lip (6) comprises with respect to its cross-section a dorsal end (8) connected to the inner surface (7) of the top deck (3) and a free distal end (9) arranged opposite to the dorsal end (8), wherein the primary sealing lip (6) with respect to its cross section is arranged in an inclined manner facing inwardly. Furthermore, at least one supporting element (10) protrudes from the inner surface (7) of the top deck (3), said supporting element (10) being arranged coaxially to and at least partially in side of the primary sealing lip (6). The at least one supporting element (10) is configured to support the primary sealing lip (6) with respect to the neck finish (2) in an applied position of the closure (1).

Coupling systems including interlocking male and female members are disclosed herein. An example apparatus includes a first coupling including a sidewall having an annular spring. The example apparatus also includes a second coupling to be coupled to the first coupling. The second coupling has an annular wall including a seal. The seal is to sealingly engage the annular spring when the second coupling is coupled to the first coupling.