Quick view Add to Cart Illustrated Parts Breakdown for Dual Valve and Actuator Assembly [mar30actdesa14] Document Part Number: T.O. No. 15A2-3-21-4 Number of pages: 6Part Number: T.O. No. 15A2-3-21-4Revision Date: 1-Dec-1962Description: Manufactured By: Barber-Colman / Parts: DYLZ 3990, DYLZ 3990A, DYLZ 3990-1, DYLZ 3990-2, DYLZ 3991, DYLZ... MSRP: Was: Now: $15.00