DC2.5/3 for general applications and our DC2.5/3-P for pressure and vacuum sealing applications. The DC2.5/3-P has a positive locking feature is excellent for interlock safety control. Both the DC's are made of durable impact absorbing urethane-polymer are UV, fuel, and chemical resistant. Both are flame retardant and non-conbustable. Their service integrity is -20 degrees to 200 degrees F, they exceed both FAA and Military standards and are approved by all major oil companies, airlines and fuel service operations. They come with a stainless lanyard assembly and have a 2 year warranty (lanyard not included) in the warranty. Please visit our website at fjordav.com for more of our aviation safety products to help you and your customer maintain clean dry fuel.