ONE WAY STRAIGHT PIPE NON RETURN VALVE QUANTITY 1 Non Return Inline Straight Piece Valve - One way Will fit internal size tubes 5mm and 6mm Design to stop the back flow of air and water passing back down the pipes or tubes. Flow is from black to white. Can be used with fish tank aquarium air pumps and dosing pumps Stops backflow to your windscreen washer jets. FAST FREE UK DISPATCH.
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