Stack Type Valve End Plate Kit For S310 & S410 Valves Part # Variations: 7-900A, 7 900A Next Day Fittings is an authorized Humphrey Distributor. If you have any questions about the Humphrey 7900A Air Valve Manifold End Kits's technical information or availability please call us at: 844-323-8752Next Day Fittings is an official Humphrey distributor, we can offer our customers the best pricing and factory lead times. Our trained and knowledgeable staff is always ready to help with any aspect of the Humphrey product purchasing process. Whether you need assistance from a customer service agent or a product engineering expert, Next Day Fittings is your Humphrey partner every step of the way.