Please fill out the form below for Cap Valve and get a quote for part number 594-456 by Mcc Powers Process Controls with NSN 4820014225593 and FSC Name is 4820 Valves Nonpowered, please include required quantity along with expected turn around time. Our knowledgeable account manager will reply you shortly. Also check for the related parts for part number 594-456. ASAP Aerospace distributes nose to tail NSN components, sub-assemblies, and assemblies for the aerospace and aviation industry.