Low profile backwater valve with lock

A low profile backwater valve, comprising:

• a hollow valve body having an inlet, an outlet, a top and a bottom;
• a pivoting valve member pivotally movable between a normally open position along the bottom of the valve body and a closed position sealing the inlet, the valve member having a hinge end that pivots about a pivot axis toward the bottom of the hollow valve body, a remote end, and opposed sides, the valve member being buoyant in water;
• characterised in that:
• a locking member is positioned in the hollow valve body;
• the locking member having a release position below the pivot axis of the valve member that permits the valve member to pivot freely, and a locking position immediately adjacent to the valve member that secures the valve member in the closed position;
• and
• a handle is attached to the locking member and accessible from outside and from the top of the hollow valve body, the handle moving the locking member between the release position and the locking position.