A valve assembly (50, 150, 250) comprising: a first part (55, 155, 255) mountable to a fluid port of a panel (12, 32, 232) and comprising a first opening (90, 190, 290) for allowing ingress of fluid into the first part from a first side of the panel, and a second opening (100, 200, 300) for allowing egress of fluid out of the first part (50, 155, 255) through the fluid port to a second side of the panel (12, 32, 232); a second part (105, 205, 305) disposed within the first part (55, 155, 255) and configured to seal the second opening (100, 200, 300) when in a first position within the first part (55, 155, 255), a deformable member (120, 220, 320) disposed within the first part (55, 155, 255) and a resilient member (115, 215, 315) biased to move the second part (105, 205, 305) to a second position within the first part (55 155, 255), so as to provide a fluid flow path from the first opening (90, 190, 290) to the second opening (100, 200, 300), wherein, when in an initial state, the deformable member (120, 220, 320) is arranged to retain the second part (105, 205, 305) in the first position, and wherein, upon contacting a liquid within the first part (55, 155, 255), at least a portion of the deformable member (120, 220, 320) is configured to deform so as to enable the resilient member (115, 215, 315) to move the second part (105, 205, 305) to the second position, characterized in that the deformable member (120, 220, 320) is disposed between the first part (55, 155, 255) and the second part (105, 205, 305), and wherein the resilient member (115, 215, 315) is biased to move the second part (105, 205, 305) towards the deformable member (120, 220, 320). a first part (55, 155, 255) mountable to a fluid port of a panel (12, 32, 232) and comprising a first opening (90, 190, 290) for allowing ingress of fluid into the first part from a first side of the panel, and a second opening (100, 200, 300) for allowing egress of fluid out of the first part (50, 155, 255) through the fluid port to a second side of the panel (12, 32, 232); a second part (105, 205, 305) disposed within the first part (55, 155, 255) and configured to seal the second opening (100, 200, 300) when in a first position within the first part (55, 155, 255), a deformable member (120, 220, 320) disposed within the first part (55, 155, 255) and a resilient member (115, 215, 315) biased to move the second part (105, 205, 305) to a second position within the first part (55 155, 255), so as to provide a fluid flow path from the first opening (90, 190, 290) to the second opening (100, 200, 300), wherein, when in an initial state, the deformable member (120, 220, 320) is arranged to retain the second part (105, 205, 305) in the first position, and wherein, upon contacting a liquid within the first part (55, 155, 255), at least a portion of the deformable member (120, 220, 320) is configured to deform so as to enable the resilient member (115, 215, 315) to move the second part (105, 205, 305) to the second position, characterized in that the deformable member (120, 220, 320) is disposed between the first part (55, 155, 255) and the second part (105, 205, 305), and wherein the resilient member (115, 215, 315) is biased to move the second part (105, 205, 305) towards the deformable member (120, 220, 320).