National has built a reputation as one of the most respected names in the industry. We have offered premium sealing solutions for more than 75 years. Our design team keeps pace with the industry and provides advanced solutions for today's vehicles. Design type spring loaded; singlelip Temperature range 40F to 225F 40C to 107C Good low temperature capability Low swell in hydrocarbon fluids Delivers quality and reliable performance for every type of repair Material Nitrile Design type Spring loaded; singlelip Temperature range Minus 40 degree Fahrenheit to 225 degree Fahrenheit Provides good low temperature capability Low swell in hydrocarbon fluids