Overfill prevention devices are vital to the safety of employees and individuals. These products are designed to protect the threads from being damaged during shipment and storage.

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    Alliance Express recognizes the importance of these products and has dedicated an entire product line to overfill prevention devices. These valve caps and plugs are also are very helpful by keeping contaminants from getting into the protected products. These caps are primarily used for propane tanks but there is also a standard valve cap for small cylinders. Alliance Express has also increased safety by adding a strap that attaches to the valve and warning labels printed in English and Spanish to some of these parts. No matter what the situation is you can never be too careful and our reliable propane cylinder valve caps can help ensure this.