The Grand Rock 4 Position 2 Partial Diversion Diverter Box is a practical and efficient solution for diverting heat. With 5-inch I.D holes and a 7-inch by 7-inch box, this diverter box offers versatility and functionality. Its 4-position, 2-partial diversion feature allows for optimal heat control. Suitable for most makes and models prior to 2007, this diverter box is not approved for use on 2007 and later emission engines. Sold individually, it provides a reliable and effective solution for heat diversion.