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 fitting. The coolant flow path through the center of the fitting is optimized to enhance coolant flow. The surface area of the coolant 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 head. The plastic fitting on this hose is a known weak point in the coolant system and is prone to cracking and leaking. This aluminum fitting serves as a direct replacement for the stock plastic part, offering a long-lasting solution that will not crack, wear out, or leak. Installation requires no modifications to the existing system. Constructed from high-quality aluminum alloy, this fitting is durable and resistant to wear. It features a smooth design with no sharp edges, ensuring unrestricted coolant flow and minimizing potential damage to the coolant stream. Built to original equipment manufacturer (OEM) specifications for a precise fit. Installation is straightforward: remove the hose end from the original plastic fitting, remove the old fitting from the head, install the new fitting into the head, then reattach the hose and hose clamp onto the new fitting. Specifications: Material: Aluminum Alloy Length: Approx. 4.3 cm / 1.69 inches Color: Silver / Red / Black / Blue Fits: 3 Series N54 335i 335 11537541992 11537544638 Note: 1. Please allow 1–2 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