Features: This product is made from high strength aerospace aluminum. Also, this product was-designed to maximize the resistance to breakage, so that it will not fail as the OEM-fitting does. In addition to this, the coolant flow-path through the center of the fitting is optimized to maximize coolant flow. Along this same line, the surface-area of the coolant flow-path is larger than the OEM pieces which further optimizes coolant flow, improving cooling-performance. This hose runs from the coolant thermostat housing to the front of the-head. The plastic-fitting on this hose is a known weak spot in the coolant system as it commonly cracks and leaks. The-ideal solution to the problem is to replace the fitting with one that will never wear-out, crack or leak. This fitting is a direct replacement for the stock plastic-fitting with no modification to any part of the system necessary. Made of high-quality aluminum, which is durable and wear-resistant. There are no-sharp corners on this fitting, so the coolant will not be damaged when it passes through. Make sure you use it for a long-time. Build to factory original-quality OE-specifications to ensure a proper fit.Simply remove the end of the hose from the plastic-fitting, then remove the fitting from the-head, then install the replacement fitting into the-head and slide the hose and hose clamp onto the fitting. Specifications: Material:Aluminum Alloy Length:Approx.4.3cm/1.69inch Color:Silver/Red/Black/Blue For 3 Series N54 335i 335 11537541992 11537544638 Package Includes: 1x Water Hose Fitting note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks for your understandings.