Yes, either 9020.140 or 9015.140 will allow full air flow. I suggest 9020.140 as it is about 3/4" shorter, just enough to allow the full range of wet-dry skimming. 9015.140 will only skim on the drier side but sometimes the foam extractor won't work in a given installation. We have an overstock of 9020.140 and I was planning to list a limited number here on clearance so let me know if you have an interest in one by PM.