Part Number 631351-18A1MR Valve Assy Manifold Rebuilt in stock with ready to ship. Get an instant quote for Cessna Aircraft Company part number 631351-18A1MR by filling form below with your desired order quantity, targeted price and the expected order-fulfilment date. Get instant quote for 631351-18A1MR. Our dedicated account manager will get back to you within 15 minutes.