The #800 – Probe control will work with the following model of Bethany grills – #400, #410, #440, #730 & #735. On grills manufactured prior to 1978, an adjustment may need to be made to the shield that your control slides into. to do this turn the grill over and loosen the two screws on the shield. Then push the shield back towards the center of the grill as far as it will go and retighten the screws. This will help the control make better contact with the prongs on the grill.