1、Suitable Models: This engine fuel primer pump is suitable for Caterpillar 623F 627E 637E 627F 621E 621F 637G 627B scraper. 2、OEM: Our scraper engine fuel primer pump's OEM is 1052508, improves performance, allows for an enhanced experience in usage. 3、Resistance to Wear and Aging: Our engine fuel primer pump is resistant to wear and fracture, anti aging and will be longer use life. 4、High Accuracy: This scraper engine fuel primer transfer pump is with high accuracy and is perfect replacement to ensure proper operation of the machine. 5、Simple Installation: This engine fuel primer transfer pump is well designed and easy to install and disassemble, and can directly replace the old or damaged parts to obtain higher strength.