System and components for receiving, storing, and dispensing fluids

A cover for removably coupling to a valving structure for covering a receiving chamber of the valving structure, the chamber comprising one or more inward protrusions on a sidewall thereof, the cover comprising:

• a covering body for covering the receiving chamber;
• and
• a sidewall extending from the covering body for being received in and engaging with the chamber, the sidewall comprising one or more gaps and one or more coupling guides each extending from a receiving end to a locking end, the receiving end in connection with one of the one or more gaps for receiving one of the one or more inward protrusions of the chamber and guiding the received inward protrusion to move therealong;
• wherein at least one of the one or more coupling guides comprises a radially flexible stopper radially outwardly extending in the coupling guide, the radially flexible stopper having a sloped surface proximal to the receiving end of the coupling guide and an abrupt stopping surface distal to the receiving end thereof, the stopping surface and the locking end of the coupling guide defining a locking area for locking the inward protrusion therein;
• and
• wherein the covering body comprises a breakable portion extending from a first edge thereof through one of the one or more gaps of the sidewall to a location adjacent a second edge opposite to the first edge such that, when the breakable portion is broken, the covering body is deformed to a connected pair of covering-body pieces laterally movable towards each other.