3-PLY SILICONE RADIATOR COOLANT HOSE FITS 68-73 NISSAN DATSUN 510 KA24DE RED Made with high quality silicone and 3-ply nylon for enhanced strength and durability. Increases engine performance and efficiency with high temperature (up to 330 Degrees Fahrenheit) and high boost application. 2 x Hose Inlet/ Outlet Inner Diameter: 1.25"/ 1.25" Hose Thickness (Approximate, Varies due to Bending): 3-Ply/ 4.00mm Size (Diameter) Tolerance: +/- 0.225" Application: 68-73 Nissan/ Datsun 510 KA MT (Fits Manual Transmission Models with KA24DE Swapped Engines ONLY). Modifications may be required for some vehicles.