Overview Product Description INLET 4000 For Air Rotors of less than 4" to 5 1/2" diameter, Inlet 4000 can be used on the following blowers: 50755-D230, 50755-D500, 50756-D230, 50756-D500, 50757-D500, A159 or A161 Packaged one per kit. Product Videos Custom Field Product Reviews