The ProLine Series Micro-Fuel Hose is manufactured with polyurethane, with no plasticizers that can cause flow contamination or tube hardening. It is extremely flexible and resilient, while also resistant to weathering, tearing, ozone radiation and surface abrasion. Polyurethanes wide operating temperature range and superior resistance to oil, grease and fuels makes it the right choice for a long lasting fuel line.Blended polyurethanes,Excellent oil resistance,133 psi working pressure upto 70 deg. F