Abstract: A vent comprises a vent body (1) having at least one air flow channel through the body between a front face and a rear face (2) of the body. At least one float controlled flap valve (13) is pivotably mounted with the body, the or each valve having a first, normal position in which air is permitted to flow through an air flow channel and a second position in which the valve pivots in the presence of water to seal the air flow channel.

Abstract: A hinge assembly for a flood gate comprises support means (1) provided with a first projecting portion (5); a hinge housing (9) having a base plate (11) formed with an aperture (13) for receiving the first projecting portion (5) of the support means (1), with a second projecting portion (21), and with a third projecting portion (15) provided with an aperture (13) receiving a hinge pin. Adjusting means (27, 28) acts between the first and second projecting portions (5,21) and threadingly engages with one thereof. The adjusting means (27,28), the support means (1), and the hinge housing (9) are configured such that rotation of the adjusting means (27,28) in one direction causes movement of the hinge housing (9) relative to the support means (1) in a first direction and such that rotation of the adjusting means (27,28) in the other direction causes movement of the hinge housing (9) relative to the support means (1) in a second direction opposite to the first axial direction.