I was wondering will this drip pan fit my grill which is a Master forge Model #3218LTN

Thanks for your question. We don't have the specs on the drip pan from that model grill. However, this replacement tray is very straightforward and would likely fit if it matches up to the dimensions of your current tray. Just keep in mind that it is a solid piece with no draining hole or bucket. As with other trays, you'll need to wipe out the grease whenever it accumulates. The tray will slide into the back of the grill. If you find that it fits, please let us know so we can add the part to our listing of that model!