[Fitment]: Suitable for 1400 series 1405 1406 carburetor, for 2300/4011/4100/4150/4160 carburetor. [Function]: This product can effectively solve the problem of slow opening of manifold heating throttle valve. Keep the carburetor of the car in the best running condition.Achieve the best performance of the vehicle. [Installation]: Install the thermostat cap in the product onto the housing, and tighten the retaining ring bolt to fix the thermostat cap in place, but the thermostat cap can rotate. Make a scribe mark on the thermostat cap and align it with the center index on the casting. Then tighten the bolts. Note: Installation guide not included, we strongly recommend you professional installation. Please check as much as possible to make sure the item is what you need. Tips:The product may be updated constantly ,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use. Note:Due to different production batches, the color of the bolt harness is random and cannot be specified. Colour:As Shown Material:Metal Package Contents: 1 * 1478 Electric Kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.