It's the one size fits all inducer.
The Bulkhead Inducer can be mounted onto almost any cooker. The inducer will fit through insulated walls up to 2-1/8”: thick or as thin as 1/8” thick. To install simply use a step drill or hole saw and make a 1-3/8” hole below the fire box grate. Adjust the snap ring for the wall thickness and insert it through the hole. Tighten the inducer nut onto the inducer tube from inside the pit. Consult factory for custom wall thicknesses. The inducer tube and hardware are made of Stainless Steel