6-ply aramid reinforced silicone, replaces transmission oil cooler coolant hose This HPS Ultra High Temp 6-ply Aramid Reinforced Silicone Transmission Oil Cooler Hose Kit is designed to replace your OEM rubber transmission oil cooler hose which weakens and fails over time. Made with premium silicone and reinforced with 6 layers of aramid, this hose kit can withstand the harshest high temperature and high pressure operating conditions of up to 500F and over 100 PSI. HPS silicone hose kits have all the correct bends and dimensions for a well-fit replacement of worn out and damaged OEM rubber hoses. Compared to the universal hoses from the local auto store, HPS silicone hose kits are much easier to work with.