The foot valve is a component in the cylinder which allows water into the cylinder and stops the water flowing out. The foot valve (complete) consists of the split pin, washer, spring, O-ring, seat & valve stop (yellow).
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The valve stop set is part of the foot valve which is fitted at the bottom of the cylinder where the water is drawn up. It consists of the valve stop (purple), O-ring, spring, washer & split pin.