ContiTech Insta-Grip™ 300 is for use with push-on style fittings at working pressure of 300 PSI. They can be a vital part of low pressure hydraulic and pneumatic systems such as shop air, general industrial, maintenance and automotive assembly. All sizes are rated to 300 PSI and non-conductive. They consist of Chemivic™ oil-and-heat-resistant synthetic rubber tube, blue synthetic rubber cover, and braided high-strength synthetic yarn reinforcement.