If you are looking for a complete hopper assembly with a TRUE PID controller to rebuild your old pellet grill, or even to build your own, this is for you. All you need to mount this into your existing or custom pellet grill, is a rectangular hole 4-1/4in by 5-1/4in. The hopper assemblies come in two lengths – 18in from center of burn pot to edge of hopper, and also 12in from center of burn pot to edge of hopper. This is the 18in hopper assembly with the upgraded stainless steel hopper lid and stainless steel burnpot which will prevent rust formation. New improved hot rod. NEW UNIVERSAL PID CONTROLLER! Can be mounted on either the left or right side of your application.*NEW* Pellet Dump Feature. Also includes pre-drilled holes to attach legs, utensil hooks, or a custom shelf!. If ordering outside the Continental U.S., you are subject to an additional shipping cost dependent on the weight of the product (Any customs/ duties for international orders are the buyers responsibility) Disclaimer: We guarantee that our hopper assemblies function properly and based on our customer submitted applications, will work on most custom applications. There are limits to size/insulation types of applications to which the hopper assembly will function properly. If one hopper assembly does not meet the required expectations of the user, then two hopper assemblies may be used. It is the buyer’s responsibility for returns if the hopper assembly is not compatible with their custom application. Improper use of the hopper assembly or improper installation is also the buyer’s responsibility for return costs. Our hopper assemblies function as described, although we cannot guarantee that it will work with your application. Smoke Daddy Inc. is not liable for any damage caused by the hopper assembly to or in applications using materials or modifications not recommended to be used with the hopper assembly. Contact us if any help is needed. Thanks, Smoke Daddy Inc.