This portable and fordable, fuel oil, overflow-prevention tank is made of transparent urethane film, processed by an all-double stitch method of high frequency welding. It is oil resistant, coldproof (–45°C), heatproof (70°C), long wearing, and airtight. Easily attached over an air release vent, this portable overflow catch performs most effectively in keeping the deck free from oil. A and B type available. When ordering, please specify the type and capacity of the tank.