This new replacement HP printhead is meant for use on our 412ml compatible ink systems utilizing HP thermal inkjet technology and are not intended for use on a genuine HP bulk ink system, or on our 423ml systems. We follow only the strictest guidelines and procedures to offer this product to you with each printhead being tested prior to shipment to you, so as to insure quality and satisfaction. As a further committment to our dedication of providing our customers with only the highest quality product for our, compatible, HP c6119a, bulk ink systems, a One year warranty accompanies each order with free US Priority Mail or UPS.