Low temperature flexibility.Exceptional abrasion resistance.Maximum kink-resistance; minimum kink memory.Resistant to a wide range of chemicals.Compliant with FDA regulations.Easy to fit in confined spaces.Meets the standards of the push fit type couplings.Silicone free.95/98 Shore A hardness.Service Temperature -40C to + 55C.4:1 safety factor.RoHS 3 compliant.Internal Dia. 4mm x External Dia. 2.5mm