Idle air control valve 862998 is for use on MerCruiser 3.0L MPI, V-6 and V-8 (305, 350 and 496 cid) stern drive or inboard engines with ECM 555. Proper functioning idle air control valve controls the amount of air needed for your engine to maintain a steady idle RPM speed. Additional gaskets or seals may be required when replacing the IAC valve. See your owners manual or service manual for more information. The Quicksilver brand has been the marine industry leader in delivering premium engine lubricants, accessories and original equipment replacement parts for more than 65 years. It applies the same quality standards as a supplier of lubricants and replacement parts for many original equipment brands in the powersports industries. Quicksilver has earned a loyal following by providing the highest quality products, validated through some of the most rigorous environments and testing procedures. No aftermarket company comes close to matching the level of research and design that goes into Quicksilver products. Buying Quicksilver is buying performance, protection and peace of mind.