Powers replacement kit for 420 valve will no longer be available and all orders for motors will automatically be upgraded to the new kit. Some parts for the 420 valves may still be available for a limited time, however, we strongly recommend upgrading all standard range 420s (models 5-9) with the 420-451 ATA upgrade kit. Kits replaced by 420-451 include: 227-339 420-521 420-561 227-340 420-560 420-161 227-341 420-522