Safefill Refillable Gas Cylinder Medium 7.5kgSafefill Refillable Gas Cylinder Medium 7. 5kg The Safefill 7. 5kg bottle is a refillable gas bottle, which can be refilled with LPG gas. Over the long run will save you . Safefill cylinders are designed to be refilled. Our cylinders feature: Automatic overfill prevention device Additional back check valve if you accidentally forget to close the valve after filling Tamper proof fittings which only allow gas to exit when connected to an appliance When