A receptacle of a connector for sealably engaging and disengaging contacts therein, the receptacle comprising: one or more closed chambers (80, 120), each closed chamber (80, 120) containing fluid, at least one of the closed chambers (80, 120) containing one or more receptacle contacts, each receptacle contact being configured to engage one of one or more plug contacts of a plug of the connector, at least a portion of each closed chamber (80, 120) being configured to be movable with respect to another portion of the closed chamber (80, 120) to permit balancing of pressure within the closed chamber (80, 120) to pressure outside the closed chamber (80, 120), characterized in that each closed chamber (80, 120) having at least one resilient end wall portion (76, 113) including a bore (93, 128) and a tap (92, 127) integrally formed with the resilient end wall portion (76, 113), the tap (92, 127) and bore (93, 128) being formed by a crescentic-shaped cut (91, 126) through the resilient end wall portion (76, 113), an outer shape of the tap (92, 127) conforming to an inner shape of the bore (93, 128), the tap (92, 127) being movable from a closed position to an open position with respect to the bore (93, 128), the resilient end wall portion (76, 113) being configured to permit one of the plug contacts to (i) sealably penetrate into the closed chamber (80, 120) by displacing the tap (92, 127) from the closed position and engage one of the receptacle contacts within the closed chamber (80, 120), and (ii) be subsequently sealably withdrawn from the closed chamber (80, 120) thereby allowing the tap (92, 127) to return to the closed position. one or more closed chambers (80, 120), each closed chamber (80, 120) containing fluid, at least one of the closed chambers (80, 120) containing one or more receptacle contacts, each receptacle contact being configured to engage one of one or more plug contacts of a plug of the connector, at least a portion of each closed chamber (80, 120) being configured to be movable with respect to another portion of the closed chamber (80, 120) to permit balancing of pressure within the closed chamber (80, 120) to pressure outside the closed chamber (80, 120), characterized in that each closed chamber (80, 120) having at least one resilient end wall portion (76, 113) including a bore (93, 128) and a tap (92, 127) integrally formed with the resilient end wall portion (76, 113), the tap (92, 127) and bore (93, 128) being formed by a crescentic-shaped cut (91, 126) through the resilient end wall portion (76, 113), an outer shape of the tap (92, 127) conforming to an inner shape of the bore (93, 128), the tap (92, 127) being movable from a closed position to an open position with respect to the bore (93, 128), the resilient end wall portion (76, 113) being configured to permit one of the plug contacts to (i) sealably penetrate into the closed chamber (80, 120) by displacing the tap (92, 127) from the closed position and engage one of the receptacle contacts within the closed chamber (80, 120), and (ii) be subsequently sealably withdrawn from the closed chamber (80, 120) thereby allowing the tap (92, 127) to return to the closed position.