which has improved low temperature flexibility retention of physical properties with heat exposure and good oil resistance as well as good ozone resistance by utilizing the mixture of acrylonitrile butadiene polychloroprene and polyoctanamer to provide the rubber compound of the tube 12 there is improved adhesion to the brass coated wire substrate 14 which improved adhesion allows for the omission of adhesion promoters from the compound formula omitting adhesion promoters is beneficial because adhesion promoters cause their own problems both in processing rubber compositions to make the finished product and in the performance of the finished product moreover the preferred rubber formulation allows for the omission of process aids such as waxes oils and the like which normally interfere with the adhesion of the rubber surface 16 to the brass coated wire braid 14 it has also been found that the preferred formulation does not require a freezing temperature as low as that currently used during the braiding process in order to achieve necessary dimensional stability accordingly there is faster production and lower refrigeration costs which result in a lower product cost moreover there is an improvement in the extrusion process because the preferred formulation crystallizes more rapidly and thus stiffens more quickly upon exiting the extruder 22 which gives improved dimensional stability during storage prior to braiding by using acrylonitrile butadiene polychloroprene and polyoctanamer to formulate the rubber compound process aids that are normally used in rubber compounds are not necessary the polyoctanamer is a preferred softener and is exemplary of materials which add thermoplastic properties to the.