Features: This product is made from high-strength aerospace aluminum and is designed to maximize resistance to breakage, providing improved durability compared to the OEM plastic fitting. The coolant flow path through the center of the fitting is optimized to enhance coolant flow. The internal surface area of the flow path is larger than that of OEM components, further improving cooling performance. This hose connects the coolant thermostat housing to the front of the engine head. The original plastic fitting on this hose is a known weak point in the cooling system and is prone to cracking and leaking. This aluminum fitting provides a durable, long-lasting solution that will not crack, wear out, or leak. It is a direct replacement for the stock plastic fitting with no modifications required. Made from high-quality aluminum alloy, it is durable and wear-resistant. The fitting has a smooth internal design with no sharp corners, allowing for unrestricted coolant flow. Built to factory original equipment specifications to ensure a precise fit. Installation is straightforward: remove the hose from the old plastic fitting, remove the old fitting from the engine head, install the new aluminum fitting into the head, then reattach the hose and hose clamp. Specifications: Material: Aluminum Alloy Length: Approx. 4.3 cm (1.69 inches) Color: Silver, Red, Black, Blue Fits: 3 Series N54 335i 335 OEM Part Numbers: 11537541992, 11537544638 Note: 1. Please allow 12 cm variation due to manual measurement. Ensure you are comfortable with this before ordering. 2. Due to differences in monitor displays, the actual color may vary slightly from the image. Package includes: 1 x Water Hose Fitting