Non-return valve 1 ½"

A non-return valve is often used to drain water: for example, with a submersible pump. When water is pushed through a non-return valve, the ball is pushed to the side (the Y shape), allowing the water to pass through freely. As soon as no more water is pushed through, the ball automatically drops down, closing off the device and stopping the water from flowing back. Please note: This also means that the non-return valve should always be installed vertically (see image) to let gravity do its job. For draining spaces, we recommend using a non-return valve; if you do not use o